I'm not seeing where it states you can't use the Wheel Masters 4-Hose Inflation Kit - 16" to 19-1/2" # WM8001 with your 2021 Freightliner S2RV chassis, but in any case I'd just recommend using the Wheel Masters 2-Hose Inflation Kit # WM8002 with the Wheel Masters Tire Pressure Valve Extenders # WM802990.
These hose inflators will work fine with your Freightliner S2RV chassis, measure 13" long, and the 90° extenders have an overall length of 1 1/2" with a 1" long bend.
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