Different coach, but driving in West Virginia mountains last week was a chore in our 25' class C. Ducksface makes good points about "time in the seat". Regardless, strong sideways gusts make handling an un-aerodynamic box a chore.
A tip is to not tense up and "death grip" the steering wheel. There's a learned finesse - don't try to jerk the wheel to control, rather use smooth motions with a looser grip. You'll create less tension in your arms/shoulders. Also, if driving extended distances in sideways wind gusts, make more frequent stops to stretch and relax.
Unless you move up to a top-shelf diesel pusher, your driving experience will be more hectic in general. I've accepted the fact that my MH will NEVER handle/drive like my F-150. Accordingly I change my driving habits and approach when driving the MH. Yes, I'm a LOT more tired after driving the MH, but I have a comfy bed handy to rest in!!
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