I wouldn't think so. If the motorhome is sitting level, it's not really any different than if it's sitting on level ground. If the four points the tires are sitting on lie in a single plane, there is no abnormal load on any corner.
curmudgeon: noun; a crusty, ill-tempered, irascible, cantankerous old person . . . .
79 27' Holiday Rambler Statesman, 78 32' HR Imperial, 85 36' HR Imperial 5th Wheel