If you can find the GVWR tag on the motorhome, it should have GAWR for the front and rear axles, that would give you the weight carrying capacity of the front suspension.
1957 Chevrolet 5700 LCF 283 SM420 2 speed rear, 1955 IH 300U T/A, 1978 Corvette 350 auto, 1978 Yamaha DT175, 1999 Harley Davidson Softail Fat Boy
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