Suspension Enhancement for 2021 Dodge Durango R/T Towing Race Car Trailer

Question

Question:

2021 Dodge Durango R/T with tow and go package awd 8700 lb tow capacity. Am looking for something to minimize rear squat when towing my open car trailer and race car 5500 lbs. I have reduced the factory SRT rear negative static camber as the rear tires wear out quickly on the insides. Vehicle does not have auto load leveling so am considering the Coil SumoSprings Custom Helper Springs for Coil Spring Suspension - Rear Axle Part Number: CSS-1145R. Will the helper springs help mitigate the squat. Also, will they impact the normal ride quality when not towing?

asked by: Patrick P

0

Durango Towing Race Car
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Expert Reply:

Hey Patrick, yes the SumoSprings kit part # CSS-1145R that you referenced is exactly what you are looking for. This will do a great job reducing the sag you are experiencing sag when towing your race car trailer. What kind of racing are you into?

expert reply by: Jameson C

0

Patrick P.

9/17/2025

Thanks. Will it impact the ride quality when not towing? I mainly participate in PCA events with my 718 GT4 Clubsport. Thanks again, Patrick

Jameson C.

9/17/2025

@PatrickP That's an amazing car! The feedback we've gotten on that type of SumoSpring is that the unloaded ride quality is basically unaffected yet it still provides great support.

Answer 1

Hey Joe, sorry but the Air Lift 1000 Air Helper Springs for Coil Springs item #AL60824 will not fit the 2022 Durango's with the RT trim. The only alternative I have for you is the Coil SumoSprings Custom Helper Springs for Coil Spring Suspension…

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Answer 2

Hey Pete. The best solution to address sagging in your Highlander's rear end is to use a weight distribution system. It looks like your 2017 Jayco Hummingbird tops out at 3,750 lbs. That means your tongue weights going to be somewhere around 375…

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Answer 3

I'm pretty sure you are correct that the Coil SumoSprings Custom Helper Springs #CSS-1145R will fit your 2018 Toyota Highlander, however, we haven't had the chance to test this out and SuperSprings doesn't have this listed in their…

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Answer 4

Suspension enhancement can be used with your weight distribution and will help with rear end sag. So the #CSS-1145R that fits your 2008 Toyota Highlander would help. You'll need to set your weight distribution up again.

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Answer 5

The difference between the Class II and Class III hitches has to do with their Gross Trailer Weight (GTW), their Tongue Weight (TW), and their Hitch Receiver Size. Class II trailer hitch receivers have a 1-1/4 inch receiver and can be rated up to…

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Answer 6

Hey Doug! The Firestone Ride-Rite Air Helper Springs #F35FV are the right kit for your 2026 Ford F-350 FX4 dually. However, you will need to measure to be sure it fits. The distance from the top of your rear axle to the top of the jounce bump stop…

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Answer 7

Since the pin weight of your camper is 2.1k, I recommend going with the LoadLifter 5000 opposed to the 7500. While technically there is not reason you couldn't use the 7500 kit, it really is not necessary for a camper like yours. Generally the…

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Answer 8

Yes, it will work. You'll just need to cut the Lance 6-pin connector out and rewire it into the etrailer Trailer Wiring 7-Way Upgrade Kit w/ Junction Box and RV Style Connector item #e99011. Here are the individual functions of that Lance 6-pin:…

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Answer 9

Hey Jonathon thank you so much for all of that additional information! To haul your bikes behind your class C Sprinter motorhome, while flat towing your Mini, I recommend the Hollywood Racks RV Rider Bike Rack item #HLY64FR and the Roadmaster Dual…

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Answer 10

Both the Roadmaster and Blue Ox tow bars are great options. But if it was my decision to make I would go with the Blue Ox Avail part #BX7420 as we have found that the Blue Ox tow bars are a little easier to connect and disconnect from. Also this tow…

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Answer 11

Hi Paul, you’re definitely on the right track here, and I can help you narrow this down with confidence. With your tandem 3,500 lb Dexter axles and 33 inch spacing, both the Dexter EZ Flex part #K71-652-00 and the Lippert Road Armor part #LC53CK are…

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Answer 12

Since wire color codes are NOT universal, we always recommend wiring by function, rather than wire color. If you look at the Trailer Wiring FAQ article I have linked you to, you can see some diagrams showing the proper way to wire a vehicle and…

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Suspension Enhancement for 2021 Dodge Durango R/T Towing Race Car Trailer

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