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  1. Trailer Hitch Ball Mount
  2. CURT
  3. Fits 2 Inch Hitch
  4. Fixed Ball Mount
  5. Drop - 5 Inch
  6. Rise - 4 Inch
Curt RockerBall Anti-Rattle Towing Kit - 2" Ball - 5" Drop, 4" Rise - 7,500 lbs

Curt RockerBall Anti-Rattle Towing Kit - 2" Ball - 5" Drop, 4" Rise - 7,500 lbs

Item # C43KR
Our Price: $130.95
You Save: $42.00
Trailer Hitch Ball Mount
Shipping Weight: 14 lbs
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Curt RockerBall with ShockDrop technology provides comfort and control while towing. Corrosion-resistant, black powder coated ball mount measures 9-1/4" from center of hitch pin hole to center of ball hole. Includes anti-rattle kit. Great Prices for the best trailer hitch ball mount from CURT. Curt RockerBall Anti-Rattle Towing Kit - 2" Ball - 5" Drop, 4" Rise - 7,500 lbs part number C43KR can be ordered online at or call 1-800-940-8924 for expert service.
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  • Reviews (106)
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CURT Trailer Hitch Ball Mount - C43KR

  • Fits 2 Inch Hitch
  • Fixed Ball Mount
  • Drop - 5 Inch
  • Rise - 4 Inch
  • 2 Inch Ball
  • One Ball
  • 7500 lbs GTW
  • CURT
  • Anti-Rattle Shank
  • Steel Shank - Gloss Black
  • Chrome Ball

Curt RockerBall with ShockDrop technology provides comfort and control while towing. Corrosion-resistant, black powder coated ball mount measures 9-1/4" from center of hitch pin hole to center of ball hole. Includes anti-rattle kit.


  • Ball mount with ShockDrop hitch ball lets you hook up your trailer to your tow vehicle
    • Shank slides into hitch receiver on your vehicle
    • Ball provides connection point for trailer coupler
  • Integrated ShockDrop technology
    • Cushioned isolators reduce rattling and vibration for a more comfortable ride
    • Reduces shock loads to the vehicle during sudden braking or acceleration
    • Minimizes stress on tow vehicle's suspension and brakes for extended longevity
    • Virtually maintenance-free with no airbags or bearings to service
  • Fine threads on ball provide tight, strong grip
  • Anti-swivel ball base is constructed of forged steel for dependable towing power
    • Durable carbide black powder coat finish
  • Corrosion-resistant chrome finish on ball
  • Tested for safety to meet SAE J684 specifications
  • High-gloss black powder coat finish on sturdy steel ball mount resists rust
  • Anti-rattle kit stops rattling and prevents swaying of load
    • Threaded pin allows bracket to be tightly installed
    • Constructed from high-strength steel
    • Protected by a durable yellow zinc-plated finish


  • Application: 2" x 2" trailer hitch receivers
  • Gross towing weight: 7,500 lbs
  • Tongue weight: 750 lbs
  • Ball diameter: 2"
  • Shank dimensions: 2-1/8" long x 1" diameter
  • Ball mount length: 9-1/4" from center of hitch pin hole to center of ball hole
  • Drop: 5" from top of inside of hitch opening
  • Rise: 4"
  • Pin hole diameter: 5/8"
  • Limited lifetime warranty

Towing can be brutal, especially when your setup is outfitted with standard, metal-on-metal components. Steel and aluminum can only absorb so much vibration and chucking, so every time you hit a bump in the road, that shock gets transferred to the rest of your rig, leaving it vulnerable to wear and tear. Another unfortunate side effect is an uncomfortable ride for you and your passengers.

Protect your truck and trailer from road shock, vibrations, and rattling - and stay comfortable while you drive - with the shock-absorbing Curt RockerBall hitch ball.

Shock Absorbing ShockDrop Technology

Curt RockerBall with SockDrop Technology

The RockerBall hitch ball features Curt's innovative ShockDrop technology, which is engineered to suppress vibrations and rattling while you're towing. When you hit a bump, the ball compresses around the flexible, polyurethane core. This durable material absorbs excess shock at the coupling point so that it doesn't transfer from the truck to your trailer or vice versa. The result is increased control and comfort as you tow, as well as less wear and tear on your towing setup.

Premium Construction

Curt RockerBall Construction

This hitch ball is built to last with its forged steel construction and durable powder coat finish. The flexible, shock-absorbing polyurethane core withstands extreme heat for long-lasting performance, and the chrome-plated ball resists corrosion.

Curt RockerBall Zerk Fitting

The built-in zerk allows you to lubricate the isolator core when necessary, ensuring quiet and trouble-free operation.

How to Measure Drop on Standard Ball Mount

C69HR Curt Anti-Rattle Kit for 2" Trailer Hitches

40047 Curt RockerBall Trailer Ball w/ ShockDrop - 7,500 lbs - 2"

45070 Curt Ball Mount - 4" Rise, 6" Drop, 9-1/4 Long - 7.5K

Installation Details C43KR Installation instructions

Customer Satisfaction Score:

Customer Reviews

Curt RockerBall Anti-Rattle Towing Kit - 2" Ball - 5" Drop, 4" Rise - 7,500 lbs - C43KR

Average Customer Rating:  4.7 out of 5 stars   (106 Customer Reviews)

Curt RockerBall with ShockDrop technology provides comfort and control while towing. Corrosion-resistant, black powder coated ball mount measures 9-1/4" from center of hitch pin hole to center of ball hole. Includes anti-rattle kit.


Somewhat disappointed in Curt with this product and I have always been a big Curt fan. The first one of these I ordered was the listed 3" drop unit. The base of the rocker ball is almost 1 7/8" tall so on a 4 inch drop ball mount its really only a 2 inch drop hitch so be aware when ordering. I had to send the first back and reorder the larger drop unit. When I received the larger drop unit I put it in the receiver like many other hitches I have used and proceeded to properly torque the ball down. Because the rocker ball has a pivot point its very important that it stay parallel to the receiver. Curt includes a sheet metal plate that shims in between the ball mount and the ball to prevent it from turning. The plate is no where near strong enough though and at 224 ft/lb the plate bent and the ball rotated. After the plate is bent it is almost impossible to get he thing torqued down right and lined up.


Ball is not mounted. Pictures and videos show ball mounted. And when I have bought a “kit” in the past, the ball was mounted.
I can’t attach the ball myself and only reason I purchased from eTrailer was that pictures implied that the ball would be mounted.

Etrailer Expert

Jenny N.


This ball mount comes to us from the manufacturer as a kit, without the ball mounted to the ball mount. We do have a ball mount with a 4 inch that comes with the ball torqued. It is part # C45154.


Nice solid piece with weight. The only issue I have is that the ball is only secured down with a bolt and not lockable to prevent theft.


Heavy-duty hitch! Customer service in finding the right one at etrailor was excellent!


Very good quality and fast delivery.



This hitch ball works great no slamming back & forth when stopping are starting. Just the right height for my F150 with a 4 inch curt drop receiver. I would definitely purchased again. Ran it with an unloaded trailer & a trailer with weight around 2500 lb. You want be disappointed in the purchase.


Quality products. But the added height of this Curt shock absorbing rocker ball in combination with the 5-1/2” height Brophy bar, I still bottom out and scrape the inclined road to my house while towing my boat.


I just purchased a new hideaway hitch system. But the hitch sits only 15 inches off the ground at best. And, my trailer coupling is 22-23 inches off ground. So l needed 7-8 inches of rise on the new 1.25 inch receiver system.

Internet research took me to etrailer and the Brophy hitch. I got 5.5 inches with the Brophy hitch, the highest available for a 1.25 inch receiver I could find. The others are limited to 5 inches max. I added another 1.5 inches with your Curt shock absorbing hitch. Voila, with a combined 7 inches of rise and on level ground the trailer now rides perfectly level!!!! Both parts were very easy to connect.

Delivery was speedy. Thank you for saving the day and my investment in an expensive new hideaway hitch!


on our NEW Ram 1500 truck this ball helps reduce the trailer vibration that gets transferred into the truck. it definitely helps with a smoother ride.


Greatest difference is felt with a full trailer vs empty. For reference, I haul a 3700 horse trailer and with one or two horses on board, this makes a noticeable difference in the reduction of ‘jolts’ when road seams, potholes are encountered. No noticeable difference when empty, but I am rarely empty. Good value for outcome.


I received my order one day late but everything turned out good and I already tried out the ball hitch and lock assembly and seems to tow pretty good so far


Works great in taking out the "jolt" when making quick stops and starts


Drove from San Diego to Alaska - smooth ride w/trailer...


love using the rocker ball


This all-in-one kit does everything it promises to do. I wish I'd learned about it sooner.


Kimberly, our Sales rep, was incredibly patient and amazing and guided us through our options and availability. The products arrived on time and as expected. In a world of choices you all went above and beyond any expectations.


Received product before due date however, both our WD Hitches do not have the standard piece to allow the Anti-Rotation Plate to be useful. Pictures attached.
Checking with etrailer to see what can be done before modifying either the ball or the hitches. Only other issue was packaging, it was well packed on bottom side but not on top which allowed the product to distort the box it was shipped in but it did come fully in tact with no visible harm. Mentioning this for future delivery of such items.


Like most any lock they can be a little temperamental after being out in weather a while, but a shot of lock lube or WD40 takes care of that. "Training the lock to your given key is a breeze, and I definitely like the convenience of not having to try and recall which key is needed to use them!


Just received it. I haven't had a chance to use it yet, but the quality is excellent!


makes for a better ride for sure !!


Fast Service. Excellent quality


Works great, it's a noticeably smoother ride than other hitch balls I've used.


Changed over from the conventional Ball. Noticeable difference after installing Rockerball. Makes the ride quieter and when braking no noises and no trailer play when braking or accelerating. recommended Product.


I thank it is everything that it should be. Works great

Show More Reviews

See what our Experts say about this CURT Trailer Hitch Ball Mount

  • Can Curt Rockerball Hitch Ball be Used with Surge Trailer Brakes
    The Curt Rockerballs like the # C43KR will not interfere with your surge brakes. The movement they allow would not prevent the inertia of your vehicle applying the brakes from activating your surge actuator.
    view full answer...
  • Will Curt RockerBall Interfere with Surge Brakes
    The Curt Rockerballs like the # C43KR will not interfere with your surge brakes. The movement they allow would not prevent the inertia of your vehicle applying the brakes from activating your surge actuator.
    view full answer...
  • Rust Proof Adjustable Ball Mount w/ 5 Inch Drop
    For a rust proof ball mount you're going to want the Rapid Hitch Adjustable, Aluminum Ball Mount Kit w/ 2 Greaseless Balls - 5-1/2" Drop item # AM3405. This adjustable ball mount has a 5-1/2" drop and 6-1/2" rise. It also has a two ball combo of 2" and 2-5/16" for hauling different trailers. The greaseless nylon cap allows for easy rotation between ball and coupler when towing this will help with rattle.
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  • Weight Distribution System for Leveling Tacoma and Utility Trailer Under Heavy Load
    You can always adjust your ball mount an inch or two higher than you normally have your ball mount when you know your trailer's going to be loaded down. If you are wanting to level out your 2004 Toyota Tacoma and utility trailer when it is fully loaded you will need to use a weight distribution system like the Blue Ox SwayPro Weight Distribution w/ Sway Control - Clamp On - 8,000 lbs GTW, 750 lbs TW item # BXW0750. The Blue Ox SwayPro uses optimal points of tension to help prevent trailer...
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  • Compatibility of Gen-Y Glyder Shock Absorbing Ball Mount With Surge Brakes and Lower Tongue Weight
    There will be no issues with using surge brakes along with the Gen-Y Glyder Shock Absorbing Ball Mount for 2" Hitches - 6" Drop - 7K # 325-GH-12005. Also, the Glyder can be used with a lower tongue weight and an empty trailer. The only problem is you need to be at the 4-700 lb range in order to benefit from the built-in shock absorption. If your loaded tongue weight is going to be 250-300 lbs then I would not recommend using this ball mount. Instead, I would recommend the Curt RockerBall...
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  • Gen-Y or Curt RockerBall For 300-400 lb Tongue Weight in 2 Inch Hitch
    For your tongue weight, you are right about the Gen-Y Glyder like # 325-GH-12001 not being the best option as that requires a tongue weight of at least 400 lbs to reap the benefits. So for your tongue weight below that, I recommend the RockerBall for the best shock absorption. The Convert-A-Ball and its polyurethane interior won't give you as much cushioning as the RockerBall (which is not compatible with the Convert-A-Ball or other cushioned ball mounts), which is why I like it more....
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  • Can The Curt RockerBall Be Used With Convert-A-Ball Shock Absorbing Ball Mount?
    I personally spoke to Curt who informed me their Curt RockerBall Shock Absorbing 2" Hitch Ball # C40047 should not be used with the Convert-A-Ball Ball Mounts including # CAB-UM. For the best experience I recommend using a ball mount with the correct amount of drop with the RockerBall and a anti-rattle. This will eliminate the play between the ball mount and your receiver allowing the RockerBall to absorb the trailer shock. We have a couple kits which have all the parts listed below otherwise...
    view full answer...
  • Is The Curt RockerBall Anti-Rattle Towing Kit # C43KR Available With a 2-5/16" Hitch Ball?
    For this you will need the Curt Ball Mount # C45070, Curt Anti-Rattle Kit # C69HR and the Curt RockerBall Shock Absorbing 2-5/16" Hitch Ball # C82KR. The ball mount and anti-rattle kit are the same ones that are included with the Curt RockerBall Anti-Rattle Towing Kit # C43KR.
    view full answer...
  • Why is the Rise Measurement Different From the Drop Measurement on Ball Mounts
    The reason why ball mounts like the # EBMK4 have a different rise and drop measurement is because of the way they are measured. Rise is the distance from the top of the shank to the top of the ball platform when the ball mount is oriented for greater coupler height. Drop is the distance from the top of the shank to the top of the ball platform when the ball mount is oriented for lower coupler height. Both are measured from the top of the shank. The reason for this is because you use the...
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  • Recommended Rise for Ball Mount on 2022 Subaru Outback Wilderness Towing Escapod Topo
    The Curt RockerBall Anti-Rattle Towing Kit # C43KR takes the additional height of the base of the RockerBall into account for the listed 4" rise and 5" drop. I have attached an image below showing how it is measured. Typically, you find the correct rise and drop by measuring the distance from the ground to the top of your receiver hitch opening and subtracting the distance from the ground to the bottom of the coupler. This should be done with your vehicle loaded for accuracy, you do not...
    view full answer...
    Image 1 for
  • How To Prevent Sag/Squat While Towing or Hauling with 2021 Ram 1500
    If you are experiencing sag while towing then we have some great options for a 2021 Ram 1500. This is a common problem even for those towing within their capacity. The most popular fix and what I recommend is installing a set of suspension enhancements. These are going to beef up the rear end of the truck while towing or hauling so you won't have as much sag/squat and the issues associated with this. The best type of enhancement is an air bag kit as you can adjust the pressure for your...
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  • Parts Needed to Tow a Trailer with a 2019 Chevy Trax
    We have the parts needed to tow a trailer with your 2019 Chevy Trax but the owner's manual states not to tow trailers with this vehicle so you'll be doing so at your own risk. I recommend finding/borrowing/renting a different vehicle to accomplish this but if you're bound and determined here is what you need: Draw-Tite Max-Frame Trailer Hitch Receiver - # DT32GR Trailer Wiring - LS # 118659 - OR - LT and Premier # 118751 Towing Kit - # C43KR Be sure to check out the linked ball mount...
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Info for this part was:

Employee Andrew K
Installed by:
Andrew K
Employee Michael B
Installed by:
Michael B
Employee Lindsey S
Edited by:
Lindsey S
Employee Jameson C
Expert Research:
Jameson C
Employee Chris R
Video Edited:
Chris R
Employee Wilson B
Updated by:
Wilson B
Employee Mike S
Updated by:
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Employee Noah M
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