I think it would be a reasonable idea to do basic checks of the weight balance and alignment of the motorhome. If there's not sufficient weight on the front axle, it can make for comparatively squirrelly handling; so can insufficient caster. Correcting these problems, if they exist, will make the motorhome more stable in general, including when there are crosswinds from trucks or whatever. Some suspension improvements (better anti-roll bar, for instance) might also lessen some of the difficulties.
To some extent, you just have to deal with these things. Driving a high, long vehicle with many times the cross-sectional area of a car will result in a greater sensitivity to side winds because you have a much larger sail, as it were, to catch them. If you have a relatively long overhang behind the rear axle that will also not help things any. There's a lot to be said for slowing down in situations where you encounter side winds, and being prepared to compensate appropriately with the steering.
evanrem wrote:
Wind behind a trailer might be tough to correct. Suck from passing semis can be adjusted I have found with my hitch setup. I use a pro pride and I have got it down to almost nothing on passing semis mainly by adjusting tongue weight. Picked up a new trailer this weekend and the suck was bad. Kept tweaking it and it got better still a bit more to dial it in.
While that's quite true and good advice when towing, it's not really applicable to the OP's class C (and they did not indicate they were towing a trailer with it).
