Best Rear Sumo Springs For 2021 Thor Challenger 37FH
Updated 11/03/2025 | Published 01/15/2025
Question:
I have a 2021 Thor Challenger 37FH 24,000GVW, VIN 1F66F5DN3L0A13506. Will super springs fit on the rear of my rv?
asked by: Pat V
Expert Reply:
Hello Pat, thanks for reaching out. Yes, we do have sumo springs that will fit your 2021 Thor Challenger 37FH. For the rear axle, I recommend the following:
- SumoSprings Maxim Custom Helper Springs - Rear Axle # SSR-187-54-1
These are 7,000 lb capacity springs, so they will help a lot to level your ride and improve stability. There will be some drilling required for installation. The video linked below will show you a typical installation. Feel free to reach out if you need anything else.
Product Page this Question was Asked From
SumoSprings Maxim Custom Helper Springs - Rear Axle
- Vehicle Suspension
- Towing/Load Leveling
- Bump Stops
- Suspension Only
- Extra Heavy Duty
- Rear Axle Suspension Enhancement
- SuperSprings Intl
more information >
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Jesse M.
11/3/2025
Hey Pat, how did the SumoSprings work out on your Thor Challenger? Did you notice a smoother or more stable ride after adding them? Your feedback could really help others looking to upgrade their RV suspension.