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Roadmaster Crossbar-Style Base Plate Kit - Removable Arms
Part Number: RM-521448-4
In Stock
$575.00
Retail:$808.77
You Save: $233.77
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- All Info
- Reviews (2220)
- Q & A (0)
- Photos
Roadmaster Tow Bar Base Plate - RM-521448-4
Highlights
- Custom Fit for Your Vehicle: Mounts to existing attachment points
- Ready for Flat Towing: Installs on the frame to create secure tow bar attachment points for RV towing.
- Blends In When Not Towing: Hidden bracket design leaves only small brackets visible for a clean, factory look.
- Connects and Disconnects Fast: Removable drawbars lock in place with a twist and pull free without tools.
- Built to Last: Computer-cut, all-steel construction with black powder coat resists rust and corrosion.
- Simplifies Setup: Integrated mounting points let you add an electrical plug or bracket without extra drilling.
Features to know about
Made for a Clean Front End: Partially Hidden Crossbar-Style Design
If you like a factory look when you’re not towing, this setup keeps things clean. The crossbar-style brackets mount far back on the frame, staying virtually invisible once the removable drawbars are out. On most vehicles, the brackets sit behind the grille where they stay protected from scrapes and scuffs. When you’re not towing, there’s nothing sticking out to catch your leg or ruin the look of your front end.
Hook Up Fast and Get Moving: Removable Arms with Twist-Lock Attachment
The removable drawbars click into place and twist to lock, making setup quick and intuitive. Built-in pull rings let you unlock each arm and slide it out just as easily when it’s time to disconnect. There are no extra pins or complicated levers—just twist, click, and go. This simple mechanism makes it easy to connect even if you’re doing it solo in your driveway or at the campsite.
Built to Handle the Long Haul: Computer-Cut, All-Steel Construction
Strength matters when you’re logging thousands of towing miles. The base plate’s all-steel, computer-cut construction provides a precise fit and outstanding durability. The black powder coat finish resists corrosion so it stays looking good trip after trip. With the load spread evenly through the frame-mounted brackets, you get a solid connection that stands up to long-distance towing without flex or fatigue.
Easy Setup with Confidence: Bolt-On Fit and Integrated Mounting Points
There’s no welding required—this kit bolts directly to your vehicle’s frame using the included hardware and instructions. Integrated mounting points make it simple to add a plug or electrical bracket (sold separately) so your wiring is neatly secured up front. Once installed, it’s ready to pair with Roadmaster tow bars that use a quick-disconnect crossbar (910021-00 sold separately), giving you a dependable connection every time you tow.
Specs
Features
- Hidden bracket design: Provides improved aesthetics compared with standard brackets
- Crossbar-style brackets: Sit far back for a supremely clean look
- Drawbars: Attach and remove quickly and easily
- Arms: Click to lock in place in brackets
- Built-in pull rings: Let you unlock arms so you can twist and remove them
- Computer-cut, all-steel construction: Provides exceptional strength
- Black powder coat finish: Durable and corrosion resistant
- Installation: Simple installation - no welding required
- Custom base plates: Ensure a perfect fit for your vehicle
- Integrated mounting points: Let you easily attach an electrical connector plug or bracket (sold separately)
- Compatibility: Compatible with Roadmaster tow bars with use of quick-disconnect crossbar (910021-00 - sold separately)
- Instructions and hardware: Included
- Origin: Made in the USA
- Warranty: Limited lifetime warranty
Design and Construction
- Type: Crossbar-style base plate kit with removable arms
- Material: All-steel construction
- Finish: Black powder coat
- Attachment Method: Twist lock with built-in pull rings for removal
- Visibility: Virtually invisible when drawbars are removed; brackets are mounted within the grille area for protection from scrapes and scuffs
Compatibility
- Tow Bar Compatibility: Compatible with Roadmaster tow bars using quick-disconnect crossbar (910021-00 - sold separately)
- Vehicle Fit: Custom base plates ensure a perfect fit for applicable vehicles (see specific fitment information)
Included Components
- Included: Instructions and mounting hardware
- Sold Separately: Quick-disconnect crossbar (910021-00), electrical connector plug, or bracket
Warranty and Origin
- Warranty: Limited lifetime warranty
- Country of Manufacture: Made in the USA
521448-4 Road Master EZ4 Base Plate Kit
Replaces 1432-1
This Product Fits The Following Vehicles
- 2018 - 2018 Jeep JK Wrangler 2-Door standard factory bumper - no winches or guards
- 2018 - 2018 Jeep JK Wrangler 4-Door standard factory bumper - no winches or guards
- 2010 - 2017 Jeep Wrangler 2-Door standard factory bumper - no winches or guards
- 2010 - 2017 Jeep Wrangler 4-Door standard factory bumper - no winches or guards
Customer Satisfaction Score:
94% were satisfied with this product
6% of customers were not satisfied
- Wrong item was ordered
Ratings & Reviews
4.8
2220 reviews
by:
Mike
08/16/2026
Install pretty easy. You will have to change directions of one bolt due to obstruction ( frame). Cannot torque a few of the bolts. These are the ones with wire attached.
Rock guard needed addition trimming from factory instructions.
Rock guard needed addition trimming from factory instructions.
by:
Bob T.
04/20/2014
2014
Jeep
Wrangler
Great product for my 2014 Wrangler. Good materials, solid attachment to vehicle, and looks good. The e trailer installation video was great for assisting installation. Made the install much quicker and easier. The most difficult procedure for me was disconnecting the wiring harness on the back of the bumper. An old tack puller (or tool of similar design) would have been great for leveraging the pins out of their holes. Cutting the air dam was a slow process to ensure I didn't cut too much. A paper template to mark where to cut the air dam would make this process much simpler. Again, I can't emphasize enough how great the installation video was for making the steps easier.
by:
Jeffrey
10/29/2017
etrailer service was great. Received my Roadmaster base plate in 3 days. The directions from Roadmaster were fair, but etrailer's video was excellent. I had trouble mounting my base plate as the space between the two baseplate ends were too tight. I needed to use a floor jack and bottle jack to get it on. Once it was in position everything went together fine. I trimmed the Jeep' air dam differently keeping the ends that Roadmaster wants you to cut off. I think it looks better. I also had to modify the center cut in the air dam to accommodate the breakaway switch I have.
Jeffrey
10/29/2018
Base plate has been working out great. Easy putting on and taking off.
by:
Robert M
04/09/2017
2014
Jeep
Wrangler
Bought this product from etrailer with free shipping it was cheaper than I could get in town.. The baseplates are perfect for our 2014 Jeep Wrangler and our stowmaster 5000 tow bar. The unit is built to last with heavy steel plate and nice welds. Installation is pretty easy, you just have to remove the plastic air dam, and trim it up. Etrailer has a great video going over the install. I am pretty picky, and I didn't care for the way Roadmaster has you cut the air dam. If you take your time and look at photos of the way they cut it when you have your air dam off you can make it look much better. I have enclosed pictures of my install so you can see the difference. I am very happy with the ez-4 baseplates and etrailer
by:
Gary W.
08/16/2018
Jeep
Wrangler
I purchased this EZ4 base plate to work in conjunction with the Falcon2 tow bar. It fit perfectly on my Wrangler Unlimited, and is tucked mostly out of site when not used. The two baseplate arms bolted to the cross bar of the Falcon2 are easily removed and stored away when not in use. Installation because of the weight and tight fit to the Wrangler frame, was found to be much easier with two people.
by:
John
04/17/2020
Installed this baseplate on my 2016 Jeep Wrangler Sport unlimited for use with the Roadmaster StowMaster tow bar. After some confusion as to which baseplate (RM-521448-5 or the -4) to order, I finally got all of the components and have the vehicle “tow ready”. Baseplate install is simple, but make you you measure for the cut-out in the rubber rock plate. Directions say the cut-outs should be 9” long...make them 6”.
I also ordered and installed the Hopkins 56200 light kit which is a very easy install except for routing the wiring to the front. If you can get the vehicle on a lift it would be much easier. All together it took me about 5.5 hrs to complete the install and I did it all alone (65 years old). A younger person could probably cut an hour to 90 minutes off my time.
I also ordered and installed the Hopkins 56200 light kit which is a very easy install except for routing the wiring to the front. If you can get the vehicle on a lift it would be much easier. All together it took me about 5.5 hrs to complete the install and I did it all alone (65 years old). A younger person could probably cut an hour to 90 minutes off my time.
by:
John
05/25/2020
2015
Jeep
Wrangler Unlimited
Installed on a 2015 Wrangler JKU.
Overall was an easy install with just one minor difficulty. The minor issue I had was with the 1/2” Tab Weldnut with rod (item # 16 in parts Diagram). This weld nut goes into a section of the Jeep frame that is boxed in and limited access to it hence the rod attached to it used for placement! This weld nut wanted to turn while tightening and was a little difficult to get it to tighten. It’s not designed for a wrench but I was able to get a 3/4 in open end wrench on the plate part of it and hold it for tightening. I think the intent in design is that it will turn up against the wall of frame and hold it from turning. It’s about 3/4 to short to contact the frame. This is a minor problem when installing the bottom side plate bolt on each side.
The baseplate fit very nicely and all holes lined up perfectly. Very well constructed and finished.
I trimmed the rock guard a little at a time to fit and can say that the instructions are good but say to remove a little more than needed on the depth. Take your time and trim a little at a time and trial fit it each time.
Very happy with product!
Overall was an easy install with just one minor difficulty. The minor issue I had was with the 1/2” Tab Weldnut with rod (item # 16 in parts Diagram). This weld nut goes into a section of the Jeep frame that is boxed in and limited access to it hence the rod attached to it used for placement! This weld nut wanted to turn while tightening and was a little difficult to get it to tighten. It’s not designed for a wrench but I was able to get a 3/4 in open end wrench on the plate part of it and hold it for tightening. I think the intent in design is that it will turn up against the wall of frame and hold it from turning. It’s about 3/4 to short to contact the frame. This is a minor problem when installing the bottom side plate bolt on each side.
The baseplate fit very nicely and all holes lined up perfectly. Very well constructed and finished.
I trimmed the rock guard a little at a time to fit and can say that the instructions are good but say to remove a little more than needed on the depth. Take your time and trim a little at a time and trial fit it each time.
Very happy with product!
by:
Ken
09/01/2013
Great product...Good fit and appearence. The installation instructions were FAIR at best. There are alot of missing steps in the instruction sheet, so if you are not talented with tools let a professional tackle this job. Also if you are going to install these brackets yourself, I suggest that you raise the vehicle up on jack-stands or up on a lift. I did this install while all 4 tires were on the floor and it was very difficult to reach some of the bolts in order to tighten them. The most difficult part of this install is placing the front bumper back to it's original position. It can be done, but it is best to have a helper...you will have to apply some force!!
Take your time and test fit everything, hope this helps.
Ken
Take your time and test fit everything, hope this helps.
Ken
by:
Tim G.
10/02/2015
2010
Jeep
Wrangler
I'm giving it 4 stars instead of 5 only because of documentation. Need a video for the E4 bracket installation on a 2010 Jeep Wrangler. I did it all ... a diode wiring kit ... the tow bar and bracket installation ... and converted the Motorhome from a separate to a combined wiring system while adding a charge wire ... it took me two days. Very happy with the quality of the tow bar and bracket.
by:
Ron C.
11/01/2016
2016
Jeep
Wrangler
The processes ordering, packaging, shipping, were all completed without problems. The -4 baseplate kit for my 2016 jeep wrangler fit as advertised and connected to my road master 10,000 lb tow bar without a problem. Thanks, Ron C.
by:
Joe
09/10/2020
The Roadmaster base plate kit is well made and fit the Jeep JK very well. The assembly instructions were detailed and accurate with the exception of how to cut the plastic splash/rock guard under the bumper. I questioned the dimensions provided and checked prior to cutting. I was able remove less material resulting in a better fit.
The threaded plates with wire attached are not long enough to prevent spinning when torqueing the bolts attaching the bracket to the vehicle frame. I was able to use a 7/8 open end wrench to hold the plates while torqueing the bolts. A little frustrating but as there isn't much room to access the upper plate. Roadmaster should consider manufacturing those plates longer to prevent spinning.
The customer service from Etrailer was excellent. Tammie expedited my order and provided notification when shipped and delivered. Tammie is a 5 star representative and I appreciate her attention to my order.
I recommend Roadmaster products and Etrailer.
The threaded plates with wire attached are not long enough to prevent spinning when torqueing the bolts attaching the bracket to the vehicle frame. I was able to use a 7/8 open end wrench to hold the plates while torqueing the bolts. A little frustrating but as there isn't much room to access the upper plate. Roadmaster should consider manufacturing those plates longer to prevent spinning.
The customer service from Etrailer was excellent. Tammie expedited my order and provided notification when shipped and delivered. Tammie is a 5 star representative and I appreciate her attention to my order.
I recommend Roadmaster products and Etrailer.
Joe R.
9/15/2021
Still very satisfied with the roadmaster product.
by:
Kenneth
07/25/2020
Jeep
Wrangler
The order was quickly and accurately filled, shipped, and tracked to final and quick delivery.
Part was a perfect fit and a simple install.
This was the EZ4 baseplate for a stowaway tow bar mounting to a Jeep Wrangler JKU. I am impressed with the Roadmaster last be of tow equipment, as it shows that they have gone the extra mile in making their parts fit and make a strong and safe connection between the motor home and towed vehicle
Part was a perfect fit and a simple install.
This was the EZ4 baseplate for a stowaway tow bar mounting to a Jeep Wrangler JKU. I am impressed with the Roadmaster last be of tow equipment, as it shows that they have gone the extra mile in making their parts fit and make a strong and safe connection between the motor home and towed vehicle
Kenneth
7/26/2021
Great. I sold the Jeep but when towing it, I felt very secure and my least worry would be a towing problem. Will buy again
by:
Walter
12/30/2020
Nice baseplate kit. Only problem is some of the holes didnt match up with the frame crossmember so additional holes had to be drilled . Nothing in the instructions referenced this. Also no mention of the Airconditioner lines that had to be move to place the top bolt thru the frame rails or that to drill the hole in the frame you have to raise the evap core or as an alternative measure and locate where the hole should be then drill from the blind side.
Sierra K.
2/8/2021
Thank you for your review. Referencing step 2 of the instructions it does say that due to manufacturing variances, the hole in the outside of the frame rail may not exist so some drilling may be required. As for the air conditioning lines and evap core, it sounds like your jeep has been slightly modified.
by:
Dave B
06/06/2016
Easy install to a point! Those wire nut attachments are necessary but don't hold good but I got it!
Great service and shipping from etrailer. Always a pleasure dealing with them.
Great service and shipping from etrailer. Always a pleasure dealing with them.
Dave B.
6/6/2017
Works great easy install
Dave B.
6/6/2017
Works great easy install
by:
John M
04/19/2019
2017
Jeep
Wrangler
Delivery was excellent and extremely quick. Arrived in great shape within a couple of days after order and I ordered it late in the day. The website video was great because it showed exactly what was involved and how to do it. I asked questions and got prompt answers. Have not installed yet but after I do will share pictures of installation of unit on 2017 Jeep Wrangler Unlimited. This is the third unit I have ordered from these fine people, all with excellent results. If need be will order future needs from them.
John M.
4/20/2020
Worked great and looks good. Hardly notice it’s there when not using.
by:
Roger
01/23/2025
2008
Itasca
Meridian Motorhome
Quality looks very good. I have not installed yet but did watch the video which is very good. Looked at my Jeep and no drilling will be needed!
Have an older Roadmaster Stowmaster 5000 given to me and the front plates will bolt right up for easy installation
Have an older Roadmaster Stowmaster 5000 given to me and the front plates will bolt right up for easy installation
by:
Martin S.
01/26/2016
This base plate bracket met my expectations in every way. Fits out of the way behind the bumper attached to the frame on my Jeep Unlimited. Well made and would recommend for anyone.
Martin S.
1/25/2017
Pulled my Jeep 10000 miles behind our motorhome last year and baseplate doing its job. Thanks, etrailer!
by:
Don B
09/30/2020
2011
Jeep
Wrangler Unlimited
very easy to install by myself in about an hour. all holes were already in the frame except for the 2 for the front lower cross bar. mine is a 2011 jeep other years may have them. Easy to drill had plenty of access room and easy to get to. looks good after install , sets back just far enough to hide most of it. very clean not sure i'm going to leave the the front splash shield on looks good with out it.
Don B.
10/1/2021
Working well no issues
by:
Pete S
05/20/2011
2011
Jeep
Wrangler
Jeep Wrangler Unlimited. Brackets are well made and the fit was excellant. The installation takes some time as you have to remove and reinstall the bumper and drill some 1/2" holes to get the Brackets mounted. The average homeowner who is a little mechanically inclined will have no problem. The only improvement that we see is with the instructions. Could of supplied a Template for cutting the plastic splash shield under the bumper. If you take you time with measuring the cuts the fit will be excellant.
by:
Tom
10/09/2018
Jeep
Wrangler
I’ve towed my Jeep Wrangler, using this base plate and Roadmaster Falcon 2 tow bar, over 5000 miles and it has performed flawlessly.
by:
Vernon
06/15/2019
2014
Jeep
Wrangler Unlimited
All was delivered and I have installed it. Only thing wrong with the RM-521448-4 Roadmaster Crossbar-Style base plate kit was that one of the 1-*1/2" x 3"threaded backing plate would not tighten down. Had to toss it and put in heavy duty washer and Nut and tighten it down. Otherwise great product and easy to install.
by:
Jim E.
03/19/2014
2014
Jeep
Wrangler
These base plates are going on my 2014 Jeep Wrangler Unlimited Freedom edition. This is our new tow vehicle. We previously had a 2004 Jeep Wrangler TJ. I ordered base plates for it from etrailer. Both orders were timely and received in excellent condition. Seems like everyone sells the base plates for the same price, but I went with etrailer the second time because of my great experience with the first order. I will definitely consider etrailer when I have similar needs in the future.
by:
Dale
03/16/2021
Good quality. A little difficult to install for one person. Another set of hands would make it easier. Follow the instructions to make sure that you do things in the proper order. I would buy this again.
Dale
3/17/2022
Still working as designed. Thanks
by:
John M
01/14/2017
2017
Jeep
Wrangler
Very easy to install on my 2017 Jeep Wrangler Unlimited. Very fast shipping.
John M.
1/14/2018
All of the products have been very useful and performed perfectly.
by:
Michael
05/13/2021
Installed it by myself. Works great with tow bar! Only issue is the receiver sockets on the front tend to rust which is visible from the front of the vehicle when the tow bar is not installed. I fabricated two plugs to hide the rusty sockets.
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2220
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- 2013 Jeep Wrangler Base Plate Kit to Fit Roadmaster Stowmaster Tow BarYou can utilize the crossbar mounting system on your Roadmaster StowMaster Tow Bar # RM-501 as long as you use a Roadmaster Crossbar Style base plate on your 2013 Jeep Wrangler. We have a couple of different options depending on the sub-model of your Jeep: Standard Factory Bumper - # RM-521448-4 (won't fit 10th Anniversary Rubicon or Moab Edition) 10th Anniversary Addition - # 1444-1 (won't fit with American Expedition bumper) Warn Elite Bumper 101420 - # RM92FR Warn Elite or Moab Edition...
view full answer... - Roadmaster Base Plate Kit that Fits 2016 Jeep Wrangler and Roadmaster StowMaster 5000The correct Roadmaster base plate kit that fits your 2016 Jeep Wrangler Unlimited and your Roadmaster Stowmaster # RM-501 would be the part # RM-521448-4. If you send me a picture of the base plate kit you have now there's a chance I would be able to identify it. Or even better would be if you could find a part number on it and give me that.
view full answer... - Recommended Supplemental Braking System for Flat Towing 2015 Jeep WranglerA Tow Bar and Braking System like the Ready Brute Elite combines a tow bar with a built-in supplemental braking system. The Ready Brute Elite braking system activates the brakes on your towed vehicle when your RV stops or slows. Basically the braking force of your RV works in combination with the forward surge of your towed vehicle to make it slow down and stop - like a surge brake trailer coupler. Instead I would recommend a proportional braking system like the Roadmaster tow bar braking...
view full answer... - Where to Find Torque Specs for Install Hardware for Roadmaster Base Plate 2014 Jeep WranglerOn the last page of the Roadmaster base plate kit part # RM-521448-4 instructions is a chart that has torque specs for all of the hardware. For the 1/2 inch bolts like you mentioned the correct torque spec is 57 ft lbs.
view full answer... - Roadmaster Base Plate Kit that Fits 2011 Jeep Wrangler that Can be Used with RM-501 Tow BarThe Roadmaster Direct Connect base plate kits like the # RM-521448-5 which fits your 2011 Jeep Wrangler are not compatible with tow bars that attach to the tow vehicle via a hitch ball like the # RM-501 so instead you'd need to use the crossbar base plate equivalent with the part # RM-521448-4.
view full answer... - Differences Between the Roadmaster XL and EZ4 Base PlatesAside from the difference you noted, the Roadmaster XL Base Plate Kit # 1444-1 is intended for use on Rubicon Hard Rock models only. The EZ4 Base Plate Kit # RM-521448-4 is designed for most 2 door models, but will not fit aftermarket bumpers, winches, guards, Call of Duty of 10th Anniversary models. For your 2016 Wrangler Sahara you will want to use the EZ4 # RM-521448-4 base plate kit. The other base plate option for your Sahara is the Roadmaster EZ5 Base Plate Kit # RM-521448-5. These...
view full answer... - Recommended Complete Flat Tow System for 2017 Jeep Wrangler UnlimitedFor your 2017 Jeep Wrangler Unlimited, I recommend starting with the Roadmaster Crossbar-Style Base Plate Kit - Removable Arms # RM-521448-4. This kit has removable arms to give you a very clean look when not flat towing your Jeep and also gives you a clean connection to your tow bar when towing behind your motorhome. I recommend installing this base plate using Loctite threadlocker # LT37420 to keep your hardware from vibrating loose over time. For your tow bar, I recommend the Roadmaster...
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Info for this part was:
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Cole B
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David F
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Bob T.
4/20/2015
This item works great. Have towed about 4500 miles using it. I couldnt be happier with the results.