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Anti-Sway Bars and SumoSprings for 2015 Forest River Sunseeker 2290S  

Updated 10/22/2025 | Published 09/21/2025



Question:

Hello, I was wondering what sumo springs front/back and Sway bars front/back Largest I need for a 2015 Sunseeker 2290s motorhome. IT says its a E-450 v8

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Expert Reply:

Hi Mike; does it actually have E-450 on the motorhome? I'm asking since it is listed online as an E-350. If it is an E-350 you can use the Roadmaster Rear Anti-Sway Bar - 1-5/8" Diameter # RM83ZR and Roadmaster Front Anti-Sway Bar - 1-3/8" Diameter # RM-1139-189. If it is an E-450 you need the # RM-1139-163 for the rear instead. If you have auto chains let me know since that changes which sway bar will fit.

For SumoSprings I recommend the SumoSprings Maxim Custom Helper Springs # SSR-106-47-1 for the rear and then the Solo Custom Helper Springs # SSF-106-47 for the front. It looks like that is a dually so you want to make sure you have 7" of clearance from the sidewall of your tire to the frame for the rear springs to fit. It seems like you're trying to set this up for the best ride possible so you may also want to consider adding the Roadmaster Exact Center Steering Stabilizer # RM47MR.

Any big trips coming up with your Sunseeker once you improve the suspension?

expert reply by:
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Robin H
SumoSprings Maxim
SumoSprings Maxim
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Etrailer Expert

Robin H.

10/22/2025

Hey Mike, how did things turn out with the sway bars and SumoSprings on your Sunseeker? Did the setup give you the smoother ride you were hoping for? Your update could make it easier for others working on the same motorhome.

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