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  1. Tow Bar Base Plate
  2. Roadmaster
  3. Removable Draw Bars
  4. Twist Lock Attachment
  5. Partially Hidden
THIS ITEM IS NOT A FIT FOR
2026 Ram ProMaster 1500
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Roadmaster

Roadmaster Crossbar-Style Base Plate Kit - Removable Arms

Part Number: RM-521196-4
In Stock
$575.00
Retail:$632.50
You Save: $57.50
Tow Bar Base Plate
Not Confirmed to Fit

2026 Ram ProMaster 1500

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etrailer Installation
We'll connect you with nearby partnered installers who know this exact setup.
Roadmaster's crossbar-style brackets are virtually invisible, easy to mount and simple to remove. Brackets install on your vehicle's frame to provide attachment points for your tow bar. Great Prices for the best tow bar base plate from Roadmaster. Roadmaster Crossbar-Style Base Plate Kit - Removable Arms part number RM-521196-4 can be ordered online at etrailer.com or call 1-800-940-8924 for expert service.
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Roadmaster Tow Bar Base Plate - RM-521196-4

Highlights

  • Custom Fit for Your Vehicle: Mounts to existing attachment points
  • Ready for Flat Towing: Mounts to the frame to create secure connection points for a tow bar.
  • Blends In When Not Towing: Hidden bracket design leaves a clean, nearly invisible look.
  • Quick Hook-Up and Removal: Twist-lock arms click into place and pull out for fast setup or storage.
  • Built to Last: Computer-cut, all-steel construction with black powder coat resists corrosion.
  • Simplifies Wiring Add-Ons: Integrated mounting points let you attach an electrical plug or bracket.
Made in USA

Features to know about

Built for a Clean Front End: Hidden Crossbar-Style Design

Once the arms are removed, the brackets on this base plate are virtually invisible. The crossbar-style design sits far back for a clean, factory look, keeping the front end free from bulky hardware. The remaining brackets stay tucked within the grille where they’re protected from scrapes and scuffs, so your vehicle looks neat when not towing.

Quick Connections Every Time: Twist-Lock, Removable Arms

The removable drawbars make hooking up and disconnecting simple. Each arm inserts into the bracket, clicks to lock in place, and twists free when you’re done. Built-in pull rings make it easy to unlock and remove them without tools. This twist-lock system gives you a reliable connection that’s fast to handle, whether you’re setting up in your driveway or breaking down after a long trip.

Strength You Can Count On: All-Steel, Computer-Cut Construction

This base plate bolts directly to your vehicle’s frame with no welding required. The all-steel construction is computer-cut for exceptional strength and precision, reinforced by a black powder coat finish that resists corrosion on long hauls and in rough weather. It’s a heavy-duty setup designed to tow confidently for thousands of miles.

Ready for Your Towing Setup: Compatible with Quick-Disconnect Crossbar and Accessories

It’s built to integrate easily with Roadmaster tow bars using the Quick-Disconnect Crossbar #910021-00 (sold separately). Integrated mounting points let you attach an electrical connector plug or bracket (sold separately), keeping your wiring tidy and accessible for lighting or braking systems. Hardware and instructions are included so you can get started right out of the box.

DIY-Friendly Install: Simple Bolt-On Mount with Clear Instructions

If you like doing your own installs, this kit keeps things straightforward. You’ll remove the fascia, pull back the fender liner, bolt on the crossbar, trim the fascia as needed, then reinstall everything. The instructions include pictures and torque specs to guide you through each step. In some cases a small hole may need to be drilled due to factory variances, but it’s manageable with basic tools and Loctite Threadlocker 262 (Item #LT37420).

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
  • Construction: Computer-cut, all-steel construction provides exceptional strength
  • Finish: Black powder coat finish is durable and corrosion resistant
  • Installation: Simple installation - no welding required
  • Fitment: 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)
  • Included: Instructions and mounting hardware included
  • Origin: Made in the USA
  • Warranty: Limited Lifetime Warranty

Design and Construction

  • Bracket Style: Crossbar-style, partially hidden design
  • Arms: Removable draw bars with twist lock attachment
  • Material: All-steel, computer-cut construction
  • Finish: Black powder coat for durability and corrosion resistance

Installation

  • No welding required: Bolts directly to vehicle frame
  • Included Components: Instructions and mounting hardware
  • Custom-fit base plates: Designed for specific vehicle compatibility
  • Additional Note from Installation Guidance: On some vehicles, drilling may be required if the hole in the outside of the frame rail does not exist due to manufacturing variances.
  • Recommended Product for Installation: Loctite Threadlocker 262 - High Strength - Up to 3/4" Nuts/Bolts - 0.20-Fl-Oz Tube Item # LT37420 (sold separately)

Compatibility

  • Tow Bar Compatibility: Works with Roadmaster tow bars when used with quick-disconnect crossbar #910021-00 (sold separately)
  • Vehicle Fitment Example: Designed fitment for 2017 Toyota Tacoma (as referenced in user Q&A section)
  • Accessory Compatibility: Works with Roadmaster Guardian Rock Guard #RM-4000 (sold separately)

Note

The drawbars, or front arms, on the crossbar-style series base plate kit are supremely easy to mount and remove. Just insert them into the brackets and twist to lock them in place. To remove, simply twist the arms back and pull them out. Once removed, the remaining brackets are virtually invisible, typically mounted within the grille area where they remain protected from scrapes and scuffs.

521196-4 Road Master EZ4 Base Plate Kit

Installation Details RM-521196-4 Installation instructions

This Product Fits The Following Vehicles




Ratings & Reviews

4.8

2211 reviews
5 Stars
(1864)
4 Stars
(261)
3 Stars
(48)
2 Stars
(13)
1 Star
(25)
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Roadmaster's crossbar-style brackets are virtually invisible, easy to mount and simple to remove. Brackets install on your vehicle's frame to provide attachment points for your tow bar.

by:

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:

After comparing Demco, RoadMaster, and Blue Ox base plate costs, mounting procedures, etc for my 2012 Fiat Sport, I decided to go with RoadMaster (Kit #522013-1A) for two main reasons: 1) I had the tow bar and mount adapters from another product that were the same specs as the RoadMaster tow bar and adapters to attach to the base plate, and 2) no drilling or other modifications required to mount the base plates. Blue Ox (Kit #BX2800) required I buy their tow bar and other unique configuration adapters PLUS drill two half-inch holes on either side where the base plate mounted AND hammering flat the tips on the corners of the bumper bracket the frame where the base plate mounted. Blue Ox did provide better details on the removal of the facia and bolt removal and torquing actions required for the Fiat. My biggest challenge was the removal of the facia without damaging the clips or other damage to it. Once it was off, the action of removing the bumper core from the end of the frame rails and bolting on the base plate was slick! I took a little over 4 hours to do this, but it was because I wanted to do it right, without damage, and have the confidence I could tow without issues. (Not sure how sequence will show, but labeled the pictures as "Before," "Removal," "Installation," "Finished," and "Ready to Tow.")



by:

This was the second base plate kit from etrailer that I have installed, the first being on our ‘03 Outback and this one on our new to us 2015 Subaru CrossTrek. As usual the response, shipping and delivery from etrailer was prompt and curious. They are my go to place for anything towing related.
Installation of this kit went well with only a few issues, most of which were related to our vehicle not the kit. I knew the car had been hit lightly on the LF corner, but could find nothing of concern body or frame wise when I looked the car over before buying it. Turns out the front bumper reinforcement had been tweaked a tad which made lining the bolt holes up with the holes in the base plates a tad challenging. This made the small angle brackets that go inside the frame heads tough to line up, but in the end it all fit. I did find that it was unnecessary to pull the washer reservoir or the left headlight to access the nut and washer for the long 1/2” bolt. You can easily reach and see the place from underneath after pulling the plastic encapsulation panel. When drilling that 1/2” hole be sure to angle the drill bit UP a tad otherwise you may end up having to grind a flat on the side of the large, thick washer as you can see in my picture from underneath. I used shrink wrap over the nut and bolt since there’s a wiring harness right against it. The picture of the baseplate differs a bit from the pictures so I guess they made some changes. All in all a great kit!



by:

The Jeep project went very well everything fit great and worked well. I really love Roadmaster products and quality and your company is the best place to purchase them. I sold the Jeep and replaced it with a new 2019 Chevy Equinox 2.0 L AWD and just purchased and installed the following items from you and installed them, RM-156-25 & RM-156-75 Battery Charge Line Kit, RM-146-7 Flex Coil Kit, RM-523193-4 EZ4 Plate Kit, RM-88333 Custom Seat Adapter, RM-751489 Stop Light Switch Kit and a RM-98160 Second Vehicle Brake Kit w/brakeaway. All these parts were in stock and arrived quickly and normal with you people, I really enjoy the o-line vidios as I do all my own installs. Thank you so much for your great service.
I will attach pictures of my install, you will see how I was able to fab a bracket and attach it to the existing mount on the base plate to mount the brakeaway switch and the air connection for the brake system.
I also fabricated a tail light bar as I didn't want to use mag-lights or splice into the factory lights and bulbs installed into the lights would not work as the factory brake lights will come on when the brake system is applyed and the turn siginals would not be visable.
Thanks for all you do, I would and do recommend you people to everyone who needs your products. Rob



by:

Fast shipping



by:

The installation took me about 7 hours, the facia removal was tedious , between the installation videos and instructions, I performed the task. This bar has one con, the pull rings on the removal bars are flimsy , my first pull stretched one out. I’m sure trailer has a fix for this under warranty, I hope.



by:

The representative (Sarah) was very helpful and knowledgeable, the prices are very reasonable and all my items arrived on time. When I called with a question, she was very polite, friendly and genuinely sounded like she enjoyed her job. When I discovered one of the items I ordered wasn’t needed, getting help to return was hassle free. I would recommend etrailer to anyone that needs anything RV or trailer related. I will definitely do business with them again. I am impressed.



by:

Etrailer was very easy to do business with and made it simple to ship my order directly to the RV shop that was going to install it. This was my first order from them, but I will definitely consider future purchases from them if I'm in need of something for my RV.



by:

We towed our 2004 Subaru Impreza WRX STI 3000 miles last year, this is an ideal setup, discreet when not in use, solid, and easy to get on/off. Very please with the support I received from Roadmaster as one of the bolt was missing, was sent super quickly.



by:

Not an easy install on a Trax but it is very well made and gives a clean look. I did customize by cutting down the 6 pin bracket supports to get it flush with front of the car.



by:

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.



by:

Awesome delivery speed, and a well made base plate for my 2007 Element. Installation was a breeze (thanks to my son’s heated shop) and I had to do no cutting to make this fit. I had a Stowmaster tow bar that came with my RV and etrailer was able to steer me to the correct missing parts to make this a really affordable installation. Now to get out of this snow!



by:

I’ve been purchasing products from ETrailer since 2005 and all the products I’ve purchased have been a great value. The products mentioned above installed perfectly and with the direct assistance from ETrailer everything fit as suggested. I will always interact with ETrailer as needs present themselves.



by:

Fit and finish is great, the illustration for what you trim on the bumper isn't great but otherwise pretty easy install (I ended up measuring between the mounts on the draw bar and just trimmed accordingly)



by:

After ordering the wrong crossbar, etrailer sent the correct one for our Mini Cooper quickly. However I did have to modify most of the holes as the cross bar didn’t quite fit (but close). I had to drill the three main bolt holes to 11/16 so that the bar would go over the Mini’s 3 main bumper bolts on both sides. The two lower bolt holes (each side), needed to be drilled out 3 sizes larger to accommodate the 4 bolts that come with the kit. I had to drill out the Minis lower holes to better align with the crossbars lower holes. I would also like to note it being a pain in the knuckles to reach one of the three (each side) bolts to put the stock nuts on the bolt and then try and get them tight. (The main bolt pattern for the upper bumper is diamond shape, one up tow bolts lower. (The lower “inside” bolt on each side is the one that is hard to get to and tighten.) Sorry I didn’t get picks, I was in a rush to get the car back together. There’s an angle piece on the cross bar that blocks the hard to reach bolt, it would be helpful if that could be made more accessible to reach.



by:

Overall the installation was great, however the process of drilling 3 - 1/2" holes in that little bumper that has a Rockwell Hardness of about 60, seems to be a bit over the top.The instructions are spot on, delivery was great, the quality of product was accurate. I am a happy boy!



by:

Replaced same part that was damaged in a crash. I had used my original one for close to ten years without issue. Fast shipping from etrailer.



by:

The Base plate kit is well made and came with all the necessary hardware.Installation is relatively straight forward. I did have to enlarge two of the holes that didn't quite line up. But overall I'd recommend it.



by:

Bolted right up. Installation should be done with bumper on, as you can't fit the ends through the louvers without some convincing. Works great so far. Was able to use a Stowmaster 5000 with it.



by:

Installation was a bit trying. Ended up looking very clean and almost invisible.
Using the tow bar worked super easy and our motorhome hardly noticed the Mini Cooper back there.



by:

Came quickly and is very high quality. Great directions/video from road master makes the installation step by step easy to follow.
Skill level is probably at the intermediate level depending on experience.



by:

The #118-3 is a perfect fit on my 1995 Geo Tracker. When you pull off the removable arms you would never know they are there. The Quality is very good easy to put on all you have to do is drill 4 holes the tube on the base plate fits into the tube on the frame of the tracker and with the 2 bolts it is a solid fit. I was worried about the plate nut getting it inside of the frame but it went in easy when you put it over the frame tube and use a thin piece of metal to slide it in place. I’m very happy with it. I probably could of got it on without taking my bumper off but with only 4 bolts holding my bumper on it made it easier



by:



by:

Delivery was great right part but this is the 6th baseplate I’ve installed and the instructions could be better. The pics could be better showing some bolt locations nothing is written about cutting inner fender but then look at pics showing they cut them the inner fender biggest problem.

Jenny N. profile picture

Jenny N.

4/6/2022

I checked with the manufacturer and the instructions could have been an older set. The manual will be the most up to date for the installation on a 2020 Toyota Tacoma.



by:

Fairly easy installation. Instructions were very clear and helpful. Admittedly much easier to accomplish with a vehicle lift. The only small difficulty is with the 5/8" flag nuts. The tabs had to be bent slightly to allow the big bolts to line up.
Overall about 4 hours start to finish.


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See what our Experts say about this Roadmaster Tow Bar Base Plate

  • Roadmaster Crossbar-Style Base Plate Installation Difficulty
    The install for the Roadmaster Crossbar-Style Base Plate Kit - Removable Arms Item # RM-521196-4 is super simple. You'll be able to complete it by yourself, but an extra set of hands to help hold the cross bar while you bolt it in wouldn't hurt. You'll need to remove the fascia, pull back the fender liner, bolt on the crossbar, trim your fascia, put the fender liner and fascia back on. There's an installation guide attached that comes with pictures to explain in greater detail exactly what...
    view full answer...
  • Parts Needed to Flat Tow a 2017 Toyota Tacoma Behind a Thor Ace Using NSA Ready Brake and Rock Guard
    You will need the Roadmaster Base Plate # RM-521196-4 for your 2017 Toyota Tacoma. This will allow you to use the Roadmaster Guardian Rock Guard # RM-4000. You will be able to connect your Tacoma to your Thor Ace 29.3 using the Roadmaster Nighthawk All Terrain, Non-Binding Tow Bar # RM-676 and a Quick Disconnect Crossbar # 910021-00. You may need a High-Low adapter like the 4" # RM-048-4 if the height from your receiver to the Tacoma is off by more than 3". The Accessory Kit # RM-9284-2...
    view full answer...


Info for this part was:

Employee Lindsey S
Edited by:
Lindsey S
Employee Shelly K
Written by:
Shelly K
Employee Wilson B
Updated by:
Wilson B
Employee Mike S
Updated by:
Mike S
Employee Isabelle B
Updated by:
Isabelle B

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