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Blue Ox High-Low Adapter for Tow Bars - 2" Hitches - 4" Rise/Drop - 6-1/2" Long

Blue Ox High-Low Adapter for Tow Bars - 2" Hitches - 4" Rise/Drop - 6-1/2" Long

Item # BX88129
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Achieve the proper height for your tow bar setup with this drop/rise hitch adapter. Provides either a 4" rise or a 4" drop to make up the height difference between your RV and towed vehicle. Rated at 5,000 lbs. Pin and clip included. Call 800-298-8924 to order Blue Ox accessories and parts part number BX88129 or order online at etrailer.com. Free expert support on all Blue Ox products. Guaranteed Lowest Price and Fastest Shipping for Blue Ox High-Low Adapter for Tow Bars - 2" Hitches - 4" Rise/Drop - 6-1/2" Long. Accessories and Parts reviews from real customers.
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Blue Ox Accessories and Parts - BX88129

  • Tow Bar
  • Hitch Adapter
  • Blue Ox
  • High-Low Adapter
  • Fits 2 Inch Hitch
  • 4 Inch Rise/Drop

Achieve the proper height for your tow bar setup with this drop/rise hitch adapter. Provides either a 4" rise or a 4" drop to make up the height difference between your RV and towed vehicle. Rated at 5,000 lbs. Pin and clip included.


  • Allows for proper positioning of tow bar
    • Makes up for height difference between RV's hitch and towed vehicle's base plates
  • Can be used in either rise or drop position
  • Constructed of sturdy steel
  • Resists rust and corrosion with durable powder coat finish
  • Includes pin and clip for attachment to trailer hitch
  • Made in the USA


  • Application: 2" x 2" trailer hitch receivers
  • Rise/drop: 4"
  • Receiver size: 2" x 2"
  • Maximum weight capacity: 5,000 lbs
  • Maximum tongue weight capacity: 500 lbs
  • Length (pin hole to pin hole): 6-1/2"
  • Pin hole diameter: 5/8"
  • 1-Year warranty

Note: Designed for flat towing only. Do not use to tow a trailer.

Many tow systems require some sort of hitch accessory to either raise or lower your tow bar so that it sits level. To determine if your setup needs an adapter, hook the tow bar up to your RV and towed car and measure to see how close to level it is. The "safe zone" for a motor-home-mounted tow bar ranges from 3 inches above level to 3 inches 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.

BX88129 Blue Ox Hi-Lo Drop Receiver - 4" Drop/Rise

Installation Details BX88129 Installation instructions

Video of Blue Ox High-Low Adapter for Tow Bars - 2" Hitches - 4" Rise/Drop - 6-1/2" Long

Videos are provided as a guide only. Refer to manufacturer installation instructions and specs for complete information.

Video Transcript for Blue Ox Tow Bars BX88129 Review

Customer Reviews

Blue Ox High-Low Adapter for Tow Bars - 2" Hitches - 4" Rise/Drop - 6-1/2" Long - BX88129

Average Customer Rating:  4.8 out of 5 stars   (35 Customer Reviews)

Achieve the proper height for your tow bar setup with this drop/rise hitch adapter. Provides either a 4" rise or a 4" drop to make up the height difference between your RV and towed vehicle. Rated at 5,000 lbs. Pin and clip included.

- BX88129

Blue Ox equipment is the Best & etrailer is the best supplier.They get your supplies to quick.I always try to shop etrailer first. 690980

- BX88129

The right fit and works well. 586455

- BX88129

extremly good service. delivery excellent. the right place, the right part, right away. 146309

- BX88129

Excellent service and prices. Speedy delivery. My Blue Ox towbar is now level and ready for towing the car on our next trip! 645258

- BX88129

Product is exactly as advertised. Even better was they expedited shipping at no additional cost even though I did not chose that option. The guys at eTrailer do all they can to make your experience smooth and easy. 530113

- BX88129

New RV needed longer drop to connect toad to Blue Ox tow bar. Wanted to stay with same brand adapter. Fast delivery. Have not attached yet but am sure it will work just fine. Previous 2" Blue Ox adapter worked great. 546358

- BX88129

It solves a problem with our dingy. The drop/rise adapter works as advertised. I ordered on the phone; courteous technician; prompt delivery, accurate order. In summary, a very good experience. 154630

- BX88129

Top shelf piece of equipment. Well made. 83774

Will you give me the following dimensions, please? :Overall length of product.Overall length of receiver .Receiver pin hole to front of receiver distance.Bar pinhole to bar end end thats ed into vehicle receiver distance.Thank you.
-- comment by: john - 09/01/2013


Overall length is right at 12-1/4 inches. Overall length of receiver section is 6-1/2 inches. Center of pin hole to end of receiver opening is 2-1/2 inches. Center of pin hole to end of shank measures 3 inches. A diagram showcasing these measurements will be added to the site.

-- Patrick B - 9/4/2013

- BX88129

Great product, fast shipping and outstanding customer support! 771177

- BX88129

I’ve looked everywhere for these products and etrailer was not only the only ones with them but the price was good and I received them in 3 days! I am a returning customer and will most likely be returning again!!! Thank you 733163

- BX88129

Well Made. Should work as designed. 725032

- BX88129

Excellent staff, great product knowledge, will use in the future 720570

- BX88129

Product arrived on time and was exactly what was ordered and needed. 704033

- BX88129

As expected except for burrs inside holes for pin make insertion of pin impossible. Easily taken care of however. Otherwise excellent quality. 695965

- BX88129

The product is as expected but the service is what sets eTrailer apart 677075

- BX88129

As per usual dealing with etrailer, the product was exactly what I needed and came sooner than I anticipated. etrailer had the product in stock, when the manufacturer didn't! 671097

- BX88129

Product was ordered and shipped out the same day as ordered. Arrived here and installed on the RV. No negative issues at all. 658138

- BX88129

Looks like what I need. 653211

- BX88129

Great price,fast shipping,good looking Welding and paint. 637761

- BX88129

great service fast good product 636795

- BX88129

Ordered this 4 inch step-down hitch to use to safely tow my car behind my Motorhome. It fit great both with the Motorhome hitch receiver and the Tow Bar connection. 627998

- BX88129

I have purchased products from E trailer in the past and every time have been completely satisfied. Highly recommend! 617530

- BX88129

Its steel. fits like a glove and will solve my tow bar to receiver height difference. Two reasons i bought from etrailer, was PRICE and AVAILABILITY. I called around my town to find the same adapter and no body could get one for two weeks and price was well over 40.00 more than i paid here. I ordered on a Thursday afternoon and BOOM it was here Monday on time. THANK YOU 614063

still works perfect. NO RUST
Robert - 03/26/2020


- BX88129

Good 603298

- BX88129

This is exactly as advertised. Simple, and efficient. It does the job described. It allows me to use my Blue ox tow bar to pull my Honda Fit with my Class C RV! What is EXCELLENT is the service provided by etrailer. The product is what they said, delivered faster than promised and already in use. Thanks guys! (& gals) 601980

Show More Reviews

Ask the Experts about this Blue Ox Accessories and Parts

  • Length of Blue Ox High-Low Adapter
    The Blue Ox high-low adapter, part # BX88129, is 6-1/2 inches long from one pin hole to the other so it's going to add 6-1/2 inches between the motorhome and your toad.
    view full answer...
  • High-Low Tow Bar Adapter for Blue Ox Aventa Tow Bar Towing Chevy Silverado 3500
    Blue Ox says that as long as the RV receiver height and base plate height are within three inches of each other, no adapter or riser is necessary, so you should be fine. However, if you did feel the need to use a High-Low adapter, they do offer one with a three inch rise/drop that's rated at 10,000 lbs, part # BX88235. To my knowledge, Blue Ox does not offer a riser/adapter like you describe, but Blue Ox offers a hitch immobilizer # BX88225 that might work if the sleeve sticks out...
    view full answer...
  • Will High/Low Adapters Change Hitch's Capacity
    Any towing system will only be as strong as its lowest rated component. Many high/low adapters are designed for rolling loads only, like flat towing a vehicle behind a motorhome. They'll have a fairly high towing capacity, but a rather low tongue weight capacity. The Blue Ox # BX88129, for instance has a 5000 lb towing/ 500 lb tongue weight capacity. It's rated for flat towing only, not for towing a trailer. If you can tell me what you're wanting to use the high/low adapter for, and...
    view full answer...
  • How to Select High/Low Hitch Adapter for Motorhome and Towed Vehicle to Keep Tow Bar Level
    The Blue Ox 2-Inch High-Low Adapter for Tow Bars # BX88129 has a 5000-lb towing capacity in both 4-inch rise or 4-inch drop positions. For a similar part with higher weight capacity you can use the 2-inch Roadmaster High/Low Adapter # RM-048-4 which is rated for up to 10,000-lbs towing. If your towed car is now showing unusual tire wear when towed by your new motorhome you will want to make sure that when hitched at both ends your tow bar is close to perfectly level. If the tow bar were...
    view full answer...
  • Are There Any Negative Effects of Having High-Low Adapter with Larger Drop Dimension
    Getting your towed vehicle to be as level as possible is more important than any added torque or stress that might be put on a high-low adapter that features more of a drop. A really important factor to keep in mind for your application is that a flat towed vehicle puts very little tongue weight onto the hitch of your RV, much less so than a traditional bumper pull trailer. Because of this there is virtually no negative effect of a larger drop high-low adapter compared to one with a...
    view full answer...
  • Availability of 4 inch Drop Ball for Lowering Twistep Pet Step # HE3052
    All of the 4 inch drop hi-low adapters we offer will add some length to your hitch, but the Blue Ox # BX88129 will be the shortest at 6-1/2 inches of overall length from pin to pin which will probably work the best with your PET Twistep # HE3052.
    view full answer...
  • Weight Distribution Drop Shank Recommendation to Allow Trailer To be Towed Level
    What you need is a weight distribution shank that allows more drop than what you currently have. A high low adapter is not the solution you need as it will not be designed for use with a trailer or weight distribution hitch. Instead a shank like the part # C17124 would be what you need to allow the nose of your trailer to sit lower which will allow the trailer to tow level.
    view full answer...
  • Is One Inch Height Difference Between Tow Bar Base Plates and Receiver on Tow Vehicle Acceptable
    Honestly, if it's a receiver mounted tow bar, any height difference between 1-3 inches is just fine, no worries either way. For a trailer, we typically say it'be better to be a little lower than high, but because a flat towed vehicle is a rolling load that doesn't apply much of any downward force, it doesn't really matter as long as the heights are within 3 inches of level. If it's a car-mounted tow bar you'd be better an inch low. I've linked you to some helpful articles about flat...
    view full answer...
  • How to Pick Out Correct Rise/Drop High Low Adapter for Flat Towing Vehicle
    If you check out the picture I attached you can see that when picking out a high low adapter for a flat towing setup you need to have the tow bar sit within 3 inches of level to be "safe." Otherwise suspension and tire damage might occur. First thing you need to do is measure from the ground to the top of your hitch opening on your tow vehicle and then measure from the ground to the center of your base plate kit on your towed vehicle. The difference in these two figures is the amount...
    view full answer...
  • Parts Needed to Flat Tow 2017 Jeep Wrangler Unlimited With Rugged Ridge XHD Bumper
    You can absolutely flat tow your 2017 Jeep Wrangler Unlimited with a Rugged Ridge XHD bumper and you will not need a base plate kit. What you will need is the Blue Ox Base Plate Adapter Brackets for Rugged Ridge XHD Bumpers # BX88301, which will attach directly to the bumper, as you can see in the accompanying photo and linked installation video. This bracket will require the use of a Blue Ox tow bar and for that I highly recommend the Blue Ox Alpha Tow Bar # BX7380 because of its strong...
    view full answer...
  • Flat Towing Setup for 2018 Chevy Equinox 1.5L FWD
    I checked the owner's manual for the 2018 Chevy Equinox FWD 1.5L and this car can be flat towed. Like other towable cars there is a preparation process to be followed before each trip and this is covered on page 359 of the online manual. For the labor cost alone for installing a complete flat towing setup you can figure $2000 as a "ballpark" starting point. This is labor only and is in addition to the parts' cost. The labor fee will vary depending on whether you select a non-labor-intensive...
    view full answer...
  • Recommended Parts to Dinghy Tow a 2017 Chevrolet Sonic LT Sedan
    I have the perfect setup to dinghy tow your 2017 Chevrolet Sonic LT. For a tow bar I recommend using the Blue Ox Base Plate Kit, part # BX1703. This kit does not require any welding and has base plate tabs that can be removed for a very clean look when you are not towing your Sonic. The next thing that you will need is a tow bar. I really like the Blue Ox Alpha, part # BX7380, for this setup because it works well with the base plate kit and it comes with safety cables. This tow bar...
    view full answer...
  • Effect of Using Hitch High/Low Adapter for Extra Ground Clearance with Hitch Cargo Carrier C18153
    Use of an adapter like # BX88129 along with a hitch-mount cargo carrier like the Curt # C18153 will give you the height increase you want for better ground clearance but it will also have some unavoidable and undesirable side-effects. The first is reduction of your hitch's rated capacity by 50-percent. The loss of hitch weight capacity results from the adapter moving the actual load further away from the hitch tube. The further away that load is the more leverage it applies to the hitch...
    view full answer...
  • How to Raise a Cargo Carrier for Ground Clearance on a Volkswagen Tiguan
    I recommend the Curt Multipurpose Ball Mount with 2 Inch receiver part # D210 to raise your Curt cargo carrier part # C18153. The Curt ball mount has a receiver above the ball mount that will raise your cargo carrier 3-9/16 inches off of the ground to avoid scraping the driveway. The Curt Multipurpose ball mount with extra receiver does reduce the tongue weight capacity of the hitch part # C13381 by 50 percent. That does include the weight of the cargo carrier. The high/low adapter...
    view full answer...
  • Parts Needed to Flat Tow 2014 Ford F-250 Behind Class A Motorhome
    Flat towing a vehicle behind a motorhome requires a number of components in order to be safe and legally compliant in all states. Those items are detailed in the linked article and include a tow bar, safety cables, a wiring/lighting kit, sometimes a wiring extension and high/low hitch adapter, and also a set of base plates and a braking system for the toad. I recommend Blue Ox base plates # BX2618 along with the Alpha tow bar # BX7380 since these work together without adapters and the...
    view full answer...
  • Typical Professional Installation Time for Blue Ox Base Plate Kit # BX3788 on 2015 Toyota Corolla
    I am not trying to avoid directly answering your question but the exact amount of time needed to complete a base plate installation on a vehicle can vary quite a bit. The particular equipment on a vehicle, the installer's experience and even the nature of the equipment in the shop can have an effect on the time required. Even with a well-qualified shop and technician, if it is the first time a particular base plate kit has been installed on a particular car, it will take longer than...
    view full answer...
  • Recommended Blue Ox Parts Needed to Flat Tow 2016 Chevy Colorado
    We can help you with everything you'll need for safe and legal flat towing of your 2016 Chevrolet Colorado. The essential items include a tow bar, safety cables, a wiring/lighting solution, base plates and a supplementary braking system for the towed vehicle. Often a wiring extension and a high/low adapter are also required. The linked article covers each of these in detail. Blue Ox offers base plate kit # BX1721 that fits the 4WD 2016 Chevy Colorado with or without the Adaptive Cruise...
    view full answer...
  • Hitch High-Low Extender Adapter for Use With Anti-Rattle Pin That Bolts in
    By receiver end I take it that you mean the solid shank end of the Roadmaster High-Low Adapter # RM-048-4 that fits in the trailer hitch receiver on your motorhome. If this is the case then the Curt Hitch Extender # C45791 is designed the exact same way. For a 4" drop/rise adapter that has a hollow shank you can use an anti-rattle device like part # 63232 we have the High-Low Adapter # BX88129. This allows you to insert the block from the anti-rattle pin to help keep this from moving...
    view full answer...
  • Can a 2002 Volkswagen Passat Wagon with Manual Transmission be Flat Towed
    When it comes to flat towing a vehicle the car owner's manual is the best resource for determining if it can be flat towed at all and what preparations steps, if any, are required to ready the car for this kind of transport. In general, cars with a manual transmission are often easier to equip for flat towing than cars with an automatic transmission. I reviewed an online edition of the owner's manual for the 2002 Volkswagen Passat wagon but it did not confirm if the car can be flat towed....
    view full answer...

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Info for this part was:

Edited by:
Leah B
Expert Research:
Mike L
Expert Research:
Jameson C
Expert Research:
Adam R
Written by:
Lindsey S
Video by:
Joshua S
Test Fit:
Nicholas E
Installed by:
Cole B
Video Edited:
Chris R
Updated by:
Sarah W

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