Sounds like he was afraid to drive it and was blaming the MS. (I'd probably do the same thing. Driving anything bigger than a minivan scares the crap out of me)

Maybe you can rent a smaller RV and go somewhere close by on a "practice" vacation? If that goes ok, and if your RV doesnt get sold right away before then, you can take it off consignment and then go somewhere.

Did your husband go to any classes on driving something that big? Can he take a class on driving it and maybe then he'd feel better about driving it. It might be that the stress of driving something that big, plus the stress of worrying that you'd get somewhere and flare combined is what was keeping him from taking you somewhere?