1. Weight Distribution Hitch
  2. Reese
  3. 500 lbs
  4. 600 lbs
  5. 700 lbs
  6. WD Only
Reese Weight Distribution w/out Shank - Trunnion Bar - 10,000 lbs GTW, 800 lbs TW

Reese Weight Distribution w/out Shank - Trunnion Bar - 10,000 lbs GTW, 800 lbs TW

Item # RP66021
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Weight Distribution Hitch
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Reese Weight Distribution w/out Shank - Trunnion Bar - 10,000 lbs GTW, 800 lbs TW Shank Not Included RP66021
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Customer Photos

Is this right for you? Product Expert Lindsey S says:

Yes, if you:

  • Have a trailer with 400 lbs – 800 lbs of tongue weight that doesn't experience much sway
  • Might want to upgrade to Reese's dual-cam sway control down the line
  • Have a lifted truck and won't be able to use the standard shank that typically comes with these hitches

No, if you:

  • Want sway control out of the box
  • Have a trailer frame wider than 2-1/2"
High-performance system is designed to offer the best in weight distribution with an easy-to-adjust, forged head; a raised ball platform; and flexible, powder coated steel, trunnion spring bars. Adjustable shank and hitch ball sold separately. Lowest Prices for the best weight distribution hitch from Reese. Reese Weight Distribution w/out Shank - Trunnion Bar - 10,000 lbs GTW, 800 lbs TW part number RP66021 can be ordered online at etrailer.com or call 800-298-8924 for expert service.
  • All Info
  • Reviews (2)
  • Q & A (42)
  • Photos
  • Why etrailer?

Reese Weight Distribution Hitch - RP66021

  • 500 lbs
  • 600 lbs
  • 700 lbs
  • WD Only
  • Reese
  • Fits 2 Inch Hitch
  • Shank Not Included
  • Electric Brake Compatible

High-performance system is designed to offer the best in weight distribution with an easy-to-adjust, forged head; a raised ball platform; and flexible, powder coated steel, trunnion spring bars. Adjustable shank and hitch ball sold separately.


  • Evenly distributes weight over axles of tow vehicle and trailer for stability and control
    • Creates a more level ride for both tow vehicle and trailer
  • Trunnion spring bars are hot rolled and tapered for superior strength and flexibility
    • Bars flex appropriately over uneven terrain for a controlled, even ride
    • Curved ends are designed for use with dual-cam sway control (RP26002 - sold separately)
  • Adjustable spring-bar tension - just switch links in lift chains to fine-tune
  • Desired tilt is easily achieved with serrated-washer design - no more piling on washer after washer
  • Forged, raised ball platform on head eliminates need for raised hitch ball
  • System includes head assembly, lift brackets, trunnion spring bars, lift chains, and all necessary hardware
    • Adjustable shank and trailer hitch ball sold separately
      • Ball requires threaded shank with 1-1/4" diameter


  • Tongue weight: 400 lbs - 800 lbs
  • Gross towing weight: 10,000 lbs
  • Fits: 2" x 2" trailer hitch receivers rated for use with weight-distribution systems
  • Lift-bracket positioning: mount about 30" back from hitch ball
    • Requires approximately 5-1/2" of space along trailer frame
      • Optional mounts (sold separately) that take up less space on a trailer frame are available
    • Will not fit trailer frames wider than 2-1/2"
  • Limited lifetime warranty

Included w/ RP66021Required - Sold SeparatelyOptional Add-Ons
  • System Head
  • Lift Brackets
  • Spring Bars
  • Adjustable Shank
  • Hitch Ball w/ 1-1/4" Diameter Shank
  • Bar-Style Friction Sway Control
  • Dual-Cam Sway Control

Weight Distributing Hitch

Create a stable ride for your tow vehicle and trailer with a weight-distribution hitch. Adding spring bars to your towing system applies leverage, which transfers the load that is pushing down on the rear of your vehicle to all the axles on both your tow vehicle and your trailer, resulting in an even distribution of weight throughout. The result is a smooth, level ride, as well as the ability to tow the maximum capacity of your hitch.

Selecting a Weight-Distribution System

The tongue weight rating is the most important factor in determining which size weight-distribution system you should use. If the bars of the system you choose are rated too high for your setup, they will create a rigid ride, which can result in a bouncing trailer. If, on the other hand, the bars are not rated high enough, the system will be unable to properly distribute the weight, rendering it virtually useless.

To determine the proper weight rating for a weight-distribution system, you must first determine your trailer's tongue weight. Then add to that the weight of the cargo behind the rear axle of your tow vehicle. These two measurements make up the tongue weight rating for a weight-distribution system.

Serrated Washer System

Unique Features of Reese Trunnion-Bar Weight Distribution

The easy-to-use, serrated washers on the Reese system make adjusting the tilt of the weight-distribution head a snap. This is a huge improvement over the standard pin-and-washer method, which involves piling washers - one on top of another - onto a difficult-to-access pin. The serrated-washer system lets you easily loosen, adjust and tighten a single washer and nut on either side of the head for simple, secure positioning.

The trunnion spring bars of this system slide into the weight-distribution head for quick, easy installation. With a tapered design and hot rolled steel construction, these bars offer superior flex, ensuring a smooth, controlled ride for both your tow vehicle and your trailer. In addition, these specially designed bars have rounded, hooked ends, making them the only kind of spring bars that can function with Reese's active-style, dual-cam sway control (sold separately).

66021 Reese Trunnion Bar Weight Distribution Hitch without Hitch Bar

Installation Details RP66021 Installation instructions

California residents: click here

Customer Reviews

Reese Weight Distribution w/out Shank - Trunnion Bar - 10,000 lbs GTW, 800 lbs TW - RP66021

Average Customer Rating:  5.0 out of 5 stars   (2 Customer Reviews)

High-performance system is designed to offer the best in weight distribution with an easy-to-adjust, forged head; a raised ball platform; and flexible, powder coated steel, trunnion spring bars. Adjustable shank and hitch ball sold separately.

- RP66021

Reese equipment quality is top notch. The adjustment mechanism at the head is what convinced me to pick Reese over other manufacturers. Customer service from etrailer is exceptional and will keep me coming back in the future. 180988

- RP66021

After a slight modification to my trailer (brackets fit a 2.5 inch frame; mine was 3 inches), this hitch fit perfectly and works great. Now I can tow a 3 ton tractor without worrying about putting too much strain on my rear axle. Also impressed with etrailer.com's service - the hitch arrived much sooner than expected. Will definitely be doing business on this site again. 11498


Ask the Experts about this Reese Weight Distribution Hitch

  • Is There a Weight Distribution System that Will Fit an 8 inch Tall Trailer Frame
    I have a solution for you but the Reese Weight Distribution w/out Shank # RP66021 that you referenced won't work well for you due to how tall your frame is. So what you'll need to do is install an under slung coupler on your trailer like the # CA-5335-B which basically gives you a coupler that attaches to the bottom of the trailer frame so that you can use a weight distribution system designed for underslung coupler like the # BXW1003 which has a tongue weight range of 750-1,000 lbs. You...
    view full answer...
  • Experiencing Awful Noise When Backing With Reese High Performance Weight Distribution System
    Experiencing awful noise when backing with the Reese High Performance Trunnion System, item # RP66021, is not normal. First I would recommend greasing your hitch ball and trunnion ends. Second you should check the clearance of your spring bars. You should have 5 to 6 links between the snap up hook and the spring bar when hooked and ready to tow. To adjust this, if you need to, you will have to adjust the angle of the weight distribution head and hitch ball. If you have friction sway...
    view full answer...
  • Adjusting Weight Distribution System to Eliminate Vehicle Sag
    Assuming that the weight of your camper does not exceed the capacity of the spring bars, a combination of tilting the weight distribution head rearward and tightening the chain hangers by one chain link at a time should distribute more tongue weight toward the front axle of the vehicle, thus lessening the sag at the rear bumper. If there are less than 5 links between the snap up bracket and u-bolt connecting the chains to the spring bar, adjust ballmount angle rearward. I have linked...
    view full answer...
  • How Are Spring Bars Attached to Dual-Cam Sway Control on Reese Strait-Line Weight Distribution
    On a Reese Strait-Line weight distribution system such as # RP66021 the spring bars only rest on the dual-cam sway control arms which are what the chains are attached to. They are not fixed on them. The spring bars have to be able to move freely. When the dual-cam sway control is positioned properly (I have linked the instructions for you) the spring bars cannot come off of the cams. I have linked a video review of this system for you. If you go with this system then I recommend...
    view full answer...
  • How to Install Sway Bars on Reese Weight Distribution
    We have an excellent video that will walk you through the weight distribution and sway control installation. We also have an FAQ that has answers to the most common weight distribution and sway control questions. I have attached links to both the video and the FAQ below.
    view full answer...
  • Weight Distribution System for a Ford E-350 Towing a Trailer
    The answer to your question will depend on several factors. What is the towing and tongue weight capacity of the trailer hitch that's mounted on your truck? What is your vehicle rated to tow? Does the rear of the truck squat dramatically when the truck is loaded and the trailer is attached? How much weight do you carry in the rear of the truck? Are you currently experiencing any drivability or handling problems (with the trailer attached)? The main function of a weight distribution system...
    view full answer...
  • Replacement Weight Distribution System for Reese System with Older Style Head
    We don't have that older style head anymore as it was discontinued. Honestly your best option will be to get a WD system that doesn't have a shank like the part # RP66021. This will allow you to at least reuse your shank but comes with new bars, chains, and hangers. This system has a tongue weight range of 400-800 lbs which is similar to the system you referenced.
    view full answer...
  • Compatibility of Weight Distribution System and Swivel Jack
    A weight distribution system is not designed to accommodate the space needed for a swivel jack, since typically A-frame jacks are used on A-frame trailers. If the swivel jack and weight distribution system are not working together, you will want to move the swivel jack to provide the necessary room for the weight distribution system. Another option is to replace the swivel jack with an a-frame trailer jack. We offer several A-frame jacks with wheels already attached and many other a-frame...
    view full answer...
  • Weight Distribution System for 28 ft Travel Trailer and Stock Trailer Towed by 2010 F150 4x4
    We typically calculate trailer tongue weight as 10 to 15 percent of the GTW. Anything stowed in the tow vehicle behind the rear axle needs to be added to the tongue weight figure. Given the 7700 gross trailer weight of the travel trailer you mentioned, your tongue weight can range between 770 and 1100 lbs. For this range of tongue weights, I would recommend the Reese Heavy-Duty Trunnion Bar System, part # RP66542. This system is effective on trailer tongue weights ranging from 600-1200...
    view full answer...
  • Cargo Trailer Pulls Up On Ball and Makes a Lot of Noise Over Bumps at highway Speed
    It does sound like the tongue weight was not high enough. If a trailer is empty, you can experience some of these symptoms. The tongue weight of a trailer should be between 10 and 15 percent of the gross trailer weight. For example if your trailer was fully loaded and weight 7,000 pounds, the tongue weight should be between 700 and 1,050 pounds. Proper loading of the trailer will also help. Heavier items should be centered at the bottom and you would not want one side carrying more weight...
    view full answer...
  • Weight Distribution Recommendation for a 1999 GMC Yukon SLT
    To determine the towing capacities of the 1999 GMC Yukon and if they change with the use of weight distribution, you will need to look at the owners manual in the towing section. The hitch itself on the vehicle should have a sticker that lists the capacity. You are 100 percent correct, you will want to stay within the capabilities of the vehicle. If the hitch is rated lower, then you will go by its capacities. Always go by the lower rated component in any given system. I found a manual...
    view full answer...
  • Availability of Replacement Parts for Reese Weight Distribution System # RP66021
    The pieces that came off your weight distribution/sway control system could be several things, depending on which end the pieces came from and if they came from a sway control component or a weight distribution component. Either way, you do not want to tow your trailer with a naked bar until the problem is fixed. If it came from the spring bar and it is the end that goes into the weight distribution head, it is probably the trunnion, like # 58098. This is the part that holds the spring...
    view full answer...
  • Picking Out Second Weight Distribution that Needs More Drop Similar to Pro Series RB3
    Just the parts you are wanting to replace are not available so your best option would be to go with a new system that can use the same chain hangers and does not include a shank so that you can select one with more drop like the Reese kit part # RP66021. And then for a shank part # C17123 which will give you the drop you need and for a hitch ball # 19286 and you'd be set.
    view full answer...
  • Determining Maximum Weight of Trailer That Can be Towed by 2005 Excursion 4x4 Diesel
    To determine the maximum trailer weight that can be towed, you will need to subtract the GVW (gross vehicle weight) from the GCWR (gross combined weight rating). The GVW is the curb weight of the vehicle, plus the cargo. GCWR is the maximum allowable weight for the trailer plus the tow vehicle. Given the figures you provided, when the GVW is subtracted from the GCVW, 11,500 lbs is the result, and would represent the maximum amount the trailer plus its contents can weigh. This being...
    view full answer...
  • Can a Ford F-250 and Horse Trailer Use Weight Distribution
    Your Ford F-250 will be rated for weight distribution so that would be one part of the equation that you would not need to worry about. Now horse trailers typically are fine to use with weight distribution systems, BUT a lot of horse trailers are aluminum nowadays and we have found that aluminum trailer manufacturers don't like to recommend the use of weight distribution. So what you are going to need to do is check with the manufacturer of the trailer, if it is an aluminum trailer...
    view full answer...
  • How to Pick Out a Weight Distribution System for a V-Nose Utility Trailer
    The best way to pick out a weight distribution system is to base it off of the loaded tongue weight of the setup when it is loaded and ready to tow. This figure also includes the weight of any cargo behind the rear axle of the tow vehicle. I attached a help article on determining tongue weight for you to check out as well. You will want the loaded tongue weight of your setup to fall right in the middle of the tongue weight range of the system you use. Once you know your tongue weight...
    view full answer...
  • Will a Reese Weight Distribution System Work on a V-Nose Car Hauler Trailer
    If you already have the correct chain hanging brackets on your trailer then that is great news because that means that the system will fit without using any additional hangers or modifying anything. But you will need to choose a system based on the total tongue weight of the trailer. Total tongue weight is calculated by taking the tongue weight of the trailer when loaded and ready to tow and then adding to that the weight of any cargo loaded behind the rear axle of the tow vehicle. Reese...
    view full answer...
  • Can the Spring Bars on Reese Weight Distribution System 66021 be Upgraded to Higher Capacity
    The same head is used on systems rated up to 1,200 pounds tongue weight and 12,000 pounds gross trailer weight. You can just get the higher capacity bars should you go to a heavier trailer in the future. You would use # RP66009 to go up to the max for this system. The bars are rated for tongue weights ranging from 600 to 1,200 pounds. Compare that to your current bars which are rated for 400 to 800 pounds tongue weight.
    view full answer...
  • High Performance Weight Distribution System
    The part number you referred to is the Reese High Performance Trunnion System. The weight distribution system is designed for Tongue Weights between 400-800 pounds, and a total trailer weight of 10,000 pounds. These systems are not given a particular class like a trailer hitch is, although the weight distribution system does require at least Class III hitch for installation. The instruction sheet is available using the following link located below. For your convenience I have also attached...
    view full answer...
  • Availability of Replacement 22210E Spring Bar on Reese Weight Distribution System
    I was able to share the pictures you attached of your existing Reese WD system with my contact at Reese and she unfortunately said these particular spring bars are no longer in production. They are a bit different in size too than the current models, so there isn't an alternate available that would fit the openings on your current Reese head unit. Because of this your best, and really only, option at this point will be to go with an entirely new system. For the current equivalent...
    view full answer...
  • Weight Distribution for a 2003 GMC Towing a Trailer
    Although you are getting fairly close to capacity, you should be able to tow that trailer. Keep in mind, that you will only be able to load 700 lbs of gear on that trailer, before you exceed that limit. Although in your instance, a weight distribution (W/D) system would not extend your vehicle's towing capacity, you might still benefit from using one. A W/D system would help eliminate any sqat in the rear of your vehicle that your experience with the trailer hooked up. Using a W/D system...
    view full answer...
  • Reese Weight Distribution System Recommendation for a 2012 Toyota Tundra
    The most important figure to consider when picking out a weight distribution system is the loaded tongue weight of the setup when it is ready to tow. You should note that the weight of any cargo behind the rear axle should be counted as tongue weight also. I attached an FAQ article on how to determine tongue weight for you to check out also. I would recommend you verify your tongue weight before you purchase a weight distribution system. If your loaded tongue weight is 700 lbs like you...
    view full answer...
  • 600 lb Tongue Weight Distribution System Recommendation with Ground Clearance
    The weight distribution systems that have the best ground clearance are the trunnion systems. The round bar systems come down and get closer to the ground than a trunnion would. For a similar system to the one you referenced you would want the # RP66021 as it is a trunnion with great ground clearance. Then for a shank to give you the 6 inches of drop you would need the part # RP3344.
    view full answer...
  • Weight Distribution for a Trailer with Varying Tongue Weight from 400 to 1,500 Pounds
    No worries, I can help you out with this issue. It is a common question, a varying load. There are weight distribution systems that have a tongue weight capacity range. The widest range is 600 to 1,200 pounds. There is also an 800 to 1,500 pound system. Considering that you can potentially have 1,500 pounds tongue weight you will need a system that goes at least that high. There is a Blue Ox system, # BXW1500, that is rated for up to 1,500 pounds tongue weight and requires a minimum...
    view full answer...
  • Adjusting a Weight Distribution System for Different Tongue Weights
    Generally speaking, once the system is set up so that the trailer is properly leveled not much in the way of adjustment is needed. A weight distribution system is typically rated for a range of tongue weights. For instance, the Reese High Performance Trunnion System, part # RP66021 is rated for trailers with tongue weights ranging from 400 to 800 lbs. If the trailer is loaded to the higher end of that range, the forces applied to the spring bars would be greater than a trailer loaded...
    view full answer...
  • Trailer hitch and Weight Distribution for a 2015 Jeep Grand Cherokee
    The most popular hitch for the 2015 Jeep Grand Cherokee is Curt trailer hitch # C13182. It will fit all models including diesel models and the SRT-8 models. The hitch is rated for 5,000 pounds gross trailer weight, 500 pounds tongue weight. When used with weight distribution the hitch is rated for 7,500 pounds gross trailer weight and 750 pounds tongue weight. If you plan on doing some towing you might be interested in etrailer ball mount kit # 989900. It comes with 2 ball mounts; one...
    view full answer...
  • Reusing Old Weight Distribution or Use a New System for a 2015 Lance 2285 Travel Trailer
    Since the original Curt system with the dual-cam sway control that you added provided good results I would stick with it because if it doesn't perform the way you want it to you could still try a different system. If it were me I would try the parts I already had to avoid any additional expense until necessary. But you mentioned that you have Curt system # C17052. I am not sure how you managed to use the Reese dual-cam sway control, # RP26002, because it requires spring bars with the...
    view full answer...
  • Weight Distribution System or Air Bags for a 2001 Chevy Tahoe Towing a Trailer
    There are two separate sets of limits that we are dealing with here. The vehicle itself has a towing capacity of 7700 lbs. We typically figure the tongue weight capacity as being 10 percent of that figure, or 770 lbs. Your hitch however, has capacities of 5,000 lbs/ 600 lbs tongue weight, and 12,000 lbs / 1,500 TW with a weight distribution system. Therefore, with a weight distribution system, you can safely go up to that 770 lb tongue weight figure (but no higher.) Your towing system...
    view full answer...
  • Troubleshooting a 2006 Honda Pilot With Sway Problem From a 4200 lb boat
    Judging by the picture you submitted it looks like your problem is that your ball mount is too high which is causing your trailer to not sit level. You need a ball mount with more drop than what you are currently using. I strongly urge you to check out the FAQ article I attached on determining the correct rise/drop ball mount for a setup and use the correct ball mount before you tow again. You might check your trailer suspension as well as broken suspension components can cause sway. The...
    view full answer...
  • Is a Weight Distribution System Needed for a 2008 Chevrolet TrailBlazer Towing a Coachman Freedom
    I did a bit of research and the 2008 Chevrolet TrailBlazer weighs in at somewhere around 4,500 lbs, depending on equipment. As a general rule anytime you are towing a trailer that weighs greater than 50 percent of the vehicles total weight, trailer brakes and weight distribution are recommended. You should check your TrailBlazer and hitch weight ratings to determine the actual towing capacity for your specific vehicle. The weight distribution system you referred to, # 66557, would not...
    view full answer...

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Info for this part was:

Expert Research:
Mike L
Expert Research:
Michael H
Expert Research:
Jameson C
Written by:
Lindsey S
Installed by:
Jeff D
Installed by:
Cole B
Updated by:
Laura H
Updated by:
Sarah W
Updated by:
Alexander C
Updated by:
Amanda M
Updated by:
Isabelle B

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