The SumoSprings part numbers are:
SSF-106-47 for the front (1,000 lbs)
SSR-338-54 for the rear (1,400 lbs)
I would not advise going with the lighter weight versions for such a large vehicle.
The SumoSprings helped the sway a lot but did nothing to keep the RV from bottoming out when we hit bumps with a full tank of water.
I installed the SuperSprings SSA55 which made a tremendous improvement. These are not for the casual user to install, but they made my 2020 Navion ride almost like a car. They raised the rear end about 3/4 of an inch.
I ordered the SumoSprings from Amazon. I ordered the SuperSprings directly from SuperSpringsInternational.com. I used a 15% coupon and there was no tax, so it was a great deal. The SuperSprings arrived in about a week and a half even though they quoted a 4 week dellivery time. I installed them the same day I received them. It took me about 5 hours but other users had a much more difficult time installing them.
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2020 (2019 Sprinter Chassis) Navion24D
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