Recommended Suspension Enhancement For A Class C Motorhome On A 2021 Ford E-450 Chassis

Question

Question:

Hello, I have a customer that has a 2021 Ford E-450 and he is complaining that the vehicle bounces going down the road. Rough ride. This is a motorhome Class C. What would you recommend to make the ride better for him? Thank you

asked by: Jennifer

0

Expert Reply:

Hi Jennifer,

Manufacturers do tend to forget about the suspension/ride quality when it comes to building these RV's so this is a very common issue. Luckily SuperSprings International has just what you need with their SumoSpring jounce bumpers. Their microcellular springs offer load leveling support and a much needed cushion for the suspension to help eliminate the bounce or jarring bang when your axle hits the smaller/stiffer factory bump stops. These springs are completely maintenance free so once they're installed you're good to go.

For the front suspension you'll want the SumoSprings Solo Custom Helper Springs # SSF-106-47 and for the rear the SumoSprings Maxim Custom Helper Springs # SSR-106-47-1. The rear jounce spring will have some fitment requirements (listed below) depending on the model of the motorhome.

-Requires 7 inches of minimum clearance from sidewall of tire to frame on dual rear wheel models
-Jayco models must not have J-ride installed. J-ride interferes with mounting brackets.
-Does not fit Thor Motorhome models

If you can't use the rear springs then you'll want to go with the SumoSprings Solo Custom Helper Springs # SSR-130-47 instead, which don't have the same fitment stipulations. I have a similar style to this one on my truck and the difference it for body roll when making turns was night and day.

expert reply by: Kevin C

0

Heather A.

2/17/2026

Hey Jennifer, how did things turn out after adding the SumoSprings to your customer’s E-450 motorhome? Did they notice a smoother ride and less bounce on the road? Your update could make it easier for others dealing with the same issue.

Answer 1

Hi Kevin, Thanks for writing in, and for the kind words! Sounds like you are getting things dialed in just right =) Sorry for the delay on this one. I had to reach out to SuperSprings International because nothing was showing up in our fit guide for…

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Answer 2

Hey Tim, the best option for SumoSprings that fits your 2023 Entegra 24b that is built on a 2023 E450 Class C chassis would be the part #SSR-106-40-1 for the rear and then part #SSF-106-47 for the front. Another thing that will make a huge…

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Answer 3

The SumoSprings Maxim Custom Helper Springs like part #SSR-106-40-1 are what I recommend for a 2020 Coachmen Leprechaun. The SumoSprings Solo Custom Helper Springs like part #SSR-130-54 are a good option as well but they don't engage constantly…

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Answer 4

The difference between the SumoSprings Maxim Custom Helper Springs is that part #SSR-106-40-1 is rated for 2,600 lbs and part #SSR-106-47-1 is rated for 4,600 lbs. For a Ford E-450 Motorhome with 12,000 Lb GVWR I recommend the latter, part…

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Answer 5

Yes, the E-Series Cutaway is correct for the E-350 chassis, and I was able to verify the correct SumoSprings for your 2019 Winnebago Minnie Winnie motorhome, which are the following: - SumoSprings Maxim Custom Helper Springs #SSR-106-40-1 The…

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Answer 6

Though this is a bit of an estimation, an average 2004 Chinook RV on an E-350 chassis will weigh around 10,000 pounds. This is around 4,000 pounds heavier than a standard E-350. I mention this as it will play into which SumoSprings kit you end up…

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Answer 7

The different colors of SumoSprings relate to how firm the foam is that they are made of. Blue being the lightest followed by black and then finally yellow as firmest. For what you are wanting from your 2015 Thor Majestic 28A the best solution is the…

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Answer 8

The SumoSprings Maxim Custom Helper Springs - Rear Axle #SSR-106-54-1 you referenced are for extra heavy duty and rated for 7,000-lb capacity and are designed for your rear axle while the SumoSprings Solo Custom Helper Springs - Front Axle…

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Answer 9

Between the two part numbers #SSR-130-54 and #SSR-130-47 the key difference is the amount of support each will provide for your 2021 Ford E-450 Class C motorhome. The 47 provides 1,500 lbs of additional support whereas the 54 provides 2,800 lbs. To…

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Answer 10

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 11

In order to determine the torque rating for the lug nuts on your trailer you will need to know check out the chart I attached that shows all of the torque specs for all the trailer lugs available based on stud size, wheel material and wheel size.

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Answer 12

According to Blue Ox, it'll take an experienced installer about 4 to 5 hours to complete the installation of their #BX1128 Base Plate Kit on a 2016 Jeep Grand Cherokee. The install isn't what I'd call super-difficult, but the installation…

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Recommended Suspension Enhancement For A Class C Motorhome On A 2021 Ford E-450 Chassis

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