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Roadmaster High-Low Adapter for Tow Bars - 2" Hitches - 4" Rise/Drop - 10K GTW, 400 lbs TW

Roadmaster High-Low Adapter for Tow Bars - 2" Hitches - 4" Rise/Drop - 10K GTW, 400 lbs TW

Item # RM-048-4
Our Price: $184.40
Accessories and Parts
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Shipping Weight: 20 lbs
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Make up for the height difference between your RV and towed vehicle with this hitch adapter. Provides either a 4" drop or a 4" rise. Solid shank provides strength and durability. 1-636-306-4830 to order Roadmaster accessories and parts part number RM-048-4 or order online at Free expert support on all Roadmaster products. Guaranteed Lowest Price and Fastest Shipping for Roadmaster High-Low Adapter for Tow Bars - 2" Hitches - 4" Rise/Drop - 10K GTW, 400 lbs TW. Accessories and Parts reviews from real customers.
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  • Reviews (118)
  • Q & A (0)
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  • Why etrailer?

Roadmaster Accessories and Parts - RM-048-4

  • Tow Bar
  • Hitch Adapters
  • High-Low Adapter
  • Roadmaster
  • Fits 2 Inch Hitch
  • 4 Inch Rise/Drop

Make up for the height difference between your RV and towed vehicle with this hitch adapter. Provides either a 4" drop or a 4" rise. Solid shank provides strength and durability.


  • Allows for proper positioning of tow bar
    • Makes up for height difference between RV's hitch and towed vehicle's base plates
    • Also lets you mount a bike rack, cargo carrier, or other 2" hitch accessory
  • Provides either drop or rise for adequate ground clearance
  • Constructed of sturdy steel
    • Solid shank for suprerior strength and durability
  • Resists rust and corrosion with black powder coat finish
  • Hitch pin and clip or hitch lock sold separately
  • Made in the USA


  • Application: 2" x 2" trailer hitch receivers
  • Drop/rise: 4"
  • Receiver: 2" x 2"
  • Tongue weight: 400 lbs
  • Gross towing weight: 10,000 lbs
  • Length: 14-5/8" overall
    • 9-5/8" From center of hitch pin hole to center of hitch pin hole
    • 4-1/2" From center of hitch pin hole to angled bracket
  • Limited Lifetime Warranty

Note: This adapter is designed to flat tow a vehicle only. Do not use to tow a trailer. When using with a hitch-mounted accessory, such as a bike rack or cargo carrier, the tongue weight of your hitch will be reduced by at least 50 percent.

Most tow systems require some sort of hitch accessory to either raise or lower the tow bar to an appropriate level. The "Safe Zone" for a motor-home-mounted tow bar ranges from 3" above level to 3" below. Car-mounted models must be absolutely level. This high-low adapter can provide you with the necessary drop or desired rise to achieve a level tow bar setup.

048-4 Road Master Hi-Low Hitch Adapter - 4" - 10,000 lbs GTW; 400 lbs TW

Installation Details RM-048-4 Installation instructions

Customer Satisfaction Score:

Customer Reviews

Roadmaster High-Low Adapter for Tow Bars - 2" Hitches - 4" Rise/Drop - 10K GTW, 400 lbs TW - RM-048-4

Average Customer Rating:  4.9 out of 5 stars   (118 Customer Reviews)

Make up for the height difference between your RV and towed vehicle with this hitch adapter. Provides either a 4" drop or a 4" rise. Solid shank provides strength and durability.


This hitch adapter worked as intended aligning the tow bar with the rv hitch! Etrailer is the best!


I am sorry to have to give this low rating, but the only way the holes line up if the receiver hitch adapter is in the Rise position. We need it in the Drop position. I’ll call you tomorrow.


Very heavy solid steel adapter with 10,000 pound rating. Allows me to tow my Silverado 2500 behind my RV with the tow bar levil


Needed a 4” riser to get my motorcycle carrier to have some ground clearance on our motor home. This worked perfect for my needs


Excellent customer service, even when the customer makes dumb mistakes like I did.
Great quality products as well.
There are 150 people living at my shipping address, it would have been helpful if my name were on the package instead of my phone number.


The hitch adapter was exactly as described and is going to work perfectly. Ordering on the website was easy and shipping was as promised. I didn't really consider the extension aspect, but that will also work well for me. I know I don't have my safety cables hooked up correctly in the photo (they should cross under the hitch) but I was just trying it on for size.


Great product for price. The u bolt system seems to b perfect as it took all slack out of receiver and drop hitch. The staff at e trailer go beyond expectations for customer service and provides excellent information on needed products. My complete tow pkg came from etrailer. I have bought from them in past and probably won't waste my time shopping for better price as these people are the "bomb". Hope this product works well as I just intstalled and will report after next trip. Luv etrailer. (:


Everything installed without any issues. I'm very particular so it took 2 days to complete everything. I'm sure a pro could do it much faster. Have towed the 4" lifted (and loaded) Jeep accross the Rockies about 6 times and everything is working perfectly!! Very happy camper!!


Proxy is doing a great job


Definitely good quality products and superfast deliveries. This is one company that really cares about the customers. I would recommend etrailer to everyone. I've got my 2017 Tacoma all ready to plow thanks to etrailer.
Thank You to all the people who work for etrailer...... Great job!


Fast shipping and exactly what I needed for towing F-150 with Etrailer recommendeded Roadmaster Blackhawk2 towing setup. Feel much better with Roadmaster 10k rating (matching the towbar) rather than lower rated locally available adapters.


I needed a 4" rise to get a level tow with my Blue Ox tow bars.
This works perfectly.


I had bent one leg of the towbar. I called Roadmaster to understand why for a second time. They explained that I was out of tolerance level. I was about to order when they reflected that etrailer would sell it cheaper and get it to me faster. Etrailer knew exactly what I wanted and did sell it less expensive and got it to me within a couple of days. They also had the correct hitch extension and height adjustment that I needed to correct the root cause. 20000 miles and no reoccurance. No impact to my Motor Home trip.


The people at etrailer are great I received my product before promised and was as described. All of the videos and information on their website helped me set my toad and motorhome for flat towing. Great job!


that hole in the solid bar is too far to the back by 4-6". i'm going to a metal fabricator tomorrow to see if he can drill it where it should be. as is, the receiver opening will be extended way to far out from the truck hitch.

Tommy,Thank you for your review. We do have high low adapters that measure shorter center of hitch pin hole to center of hitch pin hole. The high low adapter you purchased part RM-048-4 measures 9-5/8. I am assuming you need a 4 inch rise to be level. Part # BX88129
Blue Ox High-Low Adapter for Tow Bars - 2" Hitches - 4" Rise/Drop - 6-1/2" Long
by Blue Ox is 6-1/2 pin hole to pin hole. This part allows for up to 500 lbs in tongue weight. I have looked at the other options and this is the shortest measurement on a high low adapter with the rise and capacity you need. We do not recommend drilling a hole in the part because it can negatively affect the structural integrity of the part, causing safety issues in the future. I have attached a link for the blue ox part below.
-- Etrailer Expert Heather A - 03/02/2018
I took your advice and didnt drill the hitch, so nothing has changed in my review.
Tommy - 03/01/2019


very well made.


Great service. However, I would have rather had a lower capacity adapter. Paid twice as much as I wanted. But none are available and I was in a pinch. However, the service was fantastic!


Good quality and arrived ahead of schedule. Very professional company, highly recommend for all your towing needs.


The product arrived two days after I ordered it. I ordered an additional hitch pin and an anti-rattle clamp to go with it, and they were both there too. Everything fit, and worked just as advertised. No real surprises there, but always good when even simple things work out as they should. My main reason for writing a review is to draw attention to the number of folks that I see cruising the highways without a hitch drop like this to align their tow bar setup properly. This part wasn't expensive or difficult to find or install. Kudos to etrailer for making it easy.


Super heavy duty!
I ordered it because
it had all of the ratings and requirements needed, and more. This adapter is rated for 10,000 lbs. But I bet it would with stand triple. it is SOLID 2" x 2" steel,not just square tubing.
Really pleased!


Solid shank is awesome


I have been setting up my 2017 Fiat for towing with my mhome. All parts were on time and worked perfectly. Greg & Reesa was very helpful and knew exactly what I would need to get the job done. Etrailer has my business from now on . The patriot 2 brake system works excellent and that was my biggest concern. Glad I called on etrailer and will again in the future, they have it going on!


Very heavy duty and well built.


Very solid product. is a great resource for informative and installation videos. Have used many of their videos to assist in installing other products purchased from them.


Although I haven't used yet, (will in 2 wks), the hitch extension appears to be well made.
etrailer provided superb service and this heavy product arrived in good shape, no damage to the carton or the hitch.

Show More Reviews

See what our Experts say about this Roadmaster Accessories and Parts

  • High Low Hitch Adapter Recommendation for 2018 Toyota Sienna
    We have the Roadmaster High-Low Adapter # RM-048-4 that should work for your application but you'll want to measure first. If you measure from the center of your hitch pin hole out to the furthest point out on the rear bumper and it's less than 9-5/8 inches The # RM-048-4 will fit and clear the bumper. Just looking at your picture I can't see how this wouldn't work but it never hurts to measure to be sure.
    view full answer...
    Image 1 for
  • How to Choose the Correct High-Low Adapter for Flat Towing
    It sounds to me like you are referring to a high-low adapter. A high-low adapter will attach to the RV's trailer hitch receiver and lower/raise the height at which the tow bar connects to the RV. Generally speaking, in order to find the correct high-low adapter you will first need to measure from the ground up to the center of the trailer hitch receiver opening and then from the ground up to the center of the base plate kit. The difference between these measurements will give you the correct...
    view full answer...
  • Compatibility of High-Low Adapter with Hitch Mounted Motorcycle Carrier
    The Roadmaster High-Low Adapter for Tow Bars # RM-048-4 will allow you to use your carrier and give you the 4 inch drop. However, you will also reduce the tongue weight of your trailer hitch by 50%. So your hitch itself will need a tongue weight rating of 720 lbs or higher for this combination to work for you. The issue with using an adapter is that reduction in tongue weight capacity because of the extra torque that is added to the hitch receiver. Due to the weight of a motorcycle,...
    view full answer...
  • Finding the Correct Ball Mount to Tow a 64 Mallard Camper Trailer Level with 2004 Chevy Trailblazer
    It sounds like you just need a properly sized ball mount to tow the camper with your 2004 Chevy Trailblazer. Another possible option is to use an adjustable tow bar. That way you can adjust one ball mount for use on 2 vehicles. I have included a link to the adjustable ball mounts we carry and a link to an FAQ article that explains how to measure for the correct rise or drop needed to tow a trailer level. The Roadmaster High-Low Hitch Adapter, # RM-048-4, is for tow bar use only (when...
    view full answer...
  • How is Rise or Drop Measured for a High Low Adapter for Flat Towing a Vehicle Behind a Motor Home
    We measure rise or drop on high low adapters from the center of the shank that fits into the trailer hitch receiver opening up or down to the center of the receiver opening on the adapter. I have included a picture that shows this on 4 inch rise/drop adapter # RM-048-4.
    view full answer...
    Image 1 for
  • Recommendation for a High-Low Adapter with a Cargo Carrier
    The high/low adapter you would need would be Roadmaster # RM-048-4, but it's important to keep in mind that using this adapter with a cargo carrier will reduce your tongue weight by 50 percent. If the 400lbs. max weight is the tongue weight of the trailer hitch then it would be reduced to 200lbs. and if you plan to carry 400 lbs. you will need to be sure that your hitch has an 800 lb tongue weight capacity. You would just want to make sure your cargo carrier doesn't exceed this weight...
    view full answer...
  • Solution for Transporting Power Wheel Chair with 2014 Ford Explorer
    Using any type of hitch adapter is going to reduce the tongue weight capacity of the trailer hitch by 50%. This means that if the trailer hitch on your 2014 Ford Explorer has a tongue weight capacity of 500 pounds, this will be reduced to 250 pounds when using the adapter. You mentioned in your question that you have a Class II trailer hitch on your Ford Explorer. I recommend verifying this as typically this vehicle will have a Class III receiver installed. A Class II trailer hitch is...
    view full answer...
  • Solution for Needing Base Plate Kit at a Higher Level for Tow Bar to Be Level
    I wish we had that ability to do that with the removable arms from Roadmaster but they don't have rise arm setups. I believe what you'd really want is a high-low adapter to allow your tow bar to level when you are flat towing. The closest to 5 inches that we have is the 4 inch adapter # RM-048-4 which would fit well.
    view full answer...
  • Availability of 10k 4 inch Rise/Drop High Low Adapter for 2017 Thor Hurricane 31s
    Sounds like you are looking for the part # RM-048-4. This is a Roadmaster High Low adapter with a 10k capacity that has 4 inch rise/drop. The fit of this is RV specific so that's why it's not listed as a fit for your 2017 Thor Hurricane. It will fit and work well though.
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    Image 1 for
  • Can the Roadmaster High-Low Adapter Part # RM-048-4 be Used with a Motorcycle Carrier
    The best option we have for you is the Roadmaster High-Low Adapter part # RM-048-4 which is designed for flat-towing but can be used for hitch-mounted accessories like your motorcycle carrier. However, as you mentioned you will sacrifice some of the tongue weight capacity when using this or any adapter for that matter. The Roadmaster High-Low Adapter has a weight capacity of 400 lbs but it also reduces the tongue weight capacity of the trailer hitch by 50%. If the tongue weight capacity...
    view full answer...
  • Recommended Rise/Drop Adapter for Flat Towing with Between 2-4" Rise
    I may have a solution for you, and it generally sounds like you're in need of a high/low adapter like the Roadmaster # RM-048-4, which has 4" rise and a 10000-lbs capacity that would work well for this application. However, you mentioned wanting to have a dual hitch to allow you to mount something below the top receiver and unfortunately using the top receiver for the tow bar is not going to allow the bottom receiver to be used. Using a dual hitch receiver requires you to use the bottom...
    view full answer...
  • Recommendation to Lower Hitch Cargo Carrier on 2017 Jeep Wrangler Unlimited
    I have a solution for you. To lower your hitch-mount cargo carrier on your 2017 Jeep Wrangler Unlimited, I recommend using either the Roadmaster High-Low Adapter # RM-048-6 with a 6 inch drop or # RM-048-4 with a 4 inch drop, depending on how much of a drop you are needing to clear the spare tire. You will also want to make sure you do not run into any ground clearance issues with lowering the carrier. As you mentioned in your question, the use of this or any similar hitch adapter is...
    view full answer...
  • Recommended High-Low Adapter for Dropping Receiver 5 To Flat Tow a 2014 Chevrolet Sonic With RV
    If you are at around 5" difference I recommend the 4" Roadmaster High-Low Adapter # RM-048-4. This will allow you to stay in the 3" +/- range for the tow bars, without sacrificing any ground clearance. The High-Low Adapter # RM-048-6 would still work but will sit 2" lower to the ground which may become an issue over bumps and driveways. You might also consider the Roadmaster Dual Hitch Receiver Adapter # RM-077-4 if you would like to carry a bike rack or other hitch mounted accessory...
    view full answer...
  • Adapter to Lower Height of Hitch-Mounted Cargo Carrier
    A 2-inch high/low hitch adapter like Roadmaster # RM-048-6 will provide 6-inches of drop (or rise) to allow your 2-inch cargo carrier to be lower than hitch height. Part # RM-048-4 will give you 4-inches of drop (or rise). Do please note three important considerations when using either of these adapters. These have a 400-lb tongue weight rating, which means that no matter how much capacity your hitch may have, the combined weight of the cargo carrier and what you load onto it cannot exceed...
    view full answer...
  • Parts Needed For Scooter Trailer That Is Not Level When Towing Behind RV
    Part # RM-048-4 is not to be used with any kind of trailer; they are to be used with towbars to pull vehicles behind RVs. They are not built to support the tongue weight of a trailer. Even though the part states that it can hold up to 400 pounds tongue weight and your trailer is at 325 pounds it should not be used. When towing a trailer, when the trailer hits a bump and comes back down it will be exerting more than 325 pounds of downward force on the tongue. This does not happen with a...
    view full answer...
  • Recommended Trailer Hitch Adapter To Raise Cargo Carrier For Ground Clearance
    We do have a hitch adapter that might work for you, but it does reduce the capacity of your trailer hitch by 50 percent when used. I recommend the Roadmaster High-Low Adapter, part # RM-076. This adapter has a 6 inch rise and is designed to work with 2 inch receivers. For an adapter with a 4 inch rise I recommend part # RM-048-4.
    view full answer...
  • High-Low Adapter to Tow a Mini Cooper Behind a Motor Home
    Most tow bars have a certain range in which they can work. That range is usually 3 inches off from level. A 6 inch drop would get you as close to level as you are going to get which is great. There is a chance that because the base plate connections on the Mini are so low that you could end up making contact with the ground and the adapter on uneven terrain or steep grades but for the most part in everyday towing situations it would not be a problem. What you could do is use an adapter...
    view full answer...
  • 4 inch High Low Adapter with More Length than # RM-048-4
    The part # RM-070 has a distance of 6 inches from the pin hole to the angled bracket and has the 4 inches of rise/drop you need so it would be a great solution.
    view full answer...
  • Can A High-Low Adapter Be Used With The Roadmaster Spare Tire Carrier When Flat Towing?
    Yes, you can use a high/low adapter such as Roadmaster High-Low Adapter for Tow Bars - 2" Hitches - 4" Rise/Drop - 10K GTW, 400 lbs TW # RM-048-4 in combination with the Roadmaster Spare Tire Carrier # RM-195125. Just keep in mind the spare tire carrier reduces your trailer hitch receiver's overall capacity by 33%. The high/low adapter will not reduce any capacity as long as you are only using it to flat tow. I attached a couple demonstration videos for you to check out.
    view full answer...
  • Trailer Hitch Adapter To Both Raise and Extend Motorcycle Carrier on an RV
    I do have some options for you but what you need to keep in mind is that hitch adapters reduce your tongue weight capacity. If you are only trying to carry a small dirt bike then I think we can get away with an (up and out) hitch adapter but if you have anything much heavier you are just going to need to place it on a trailer because it's just not safe to place that much weight on the back of a hitch with an adapter like the above. The best options we have for a small motorcycle are going...
    view full answer...
  • Can a Tow Bar be 3-1/2 Inches Out of Level when Flat Towing a 2012 Jeep Liberty
    The problem is that the tow bar can only flex so much and if it is 1/2 inch out of the safe zone now then it will be out much more when on uneven terrain. You will want it to be as level as possible. To get a more level set up you can use a high/low adapter to compensate for the 3-1/2 inches of difference between the base plates and the hitch. We have a 4 inch option, # RM-048-4, that will get you closest to level. Or if you want to be in the safe zone you could use a 2 inch drop model...
    view full answer...
  • High Low Adapter for 5-1/2 inch Coach/Toad Height Difference
    A 4 inch high-low adapter would be correct for a tow bar/base plate height difference of 5-1/2 inches since you basically just have to get within 3 inches of level. So for that the Roadmaster part # RM-048-4 would work great as it is the correct rise/drop and has a 10,000 lb total weight capacity.
    view full answer...
  • Adapter Recommendation to Give Bike Rack More Rise
    I have a solution for you, but the Roadmaster High Low Adapter part # RM-048-4 that you referenced is only designed for use in flat-towing situations so I cannot recommend it for you. Instead you would want the Curt Multipurpose Ball Mount part # D210. This will give you an additional rise of 6 inches and has a capacity of 350 lbs tongue weight. I attached a review video for you to check out.
    view full answer...
  • How to Maintain Trailer Level With Weight Distribution System Installed
    The Roadmaster High-Low Hitch Adapter # RM-048-4 that you referenced is not suitable for use with a trailer; it is intended for use with tow bars only. However, you may be able to level your hitched trailer by substituting a different shank for your weight distribution system. I have included a link to our main page for weight distribution shanks. Since I do not know the brand or type of system you are using you can use the filters in the left margin to narrow the results based on the...
    view full answer...

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