I have a Pro Tec cover for my motorhome and although I haven't actually used it yet it appears to be very good quality. Being such big vehicles to wash the big appeal is the van staying dry and clean over the winter months when we won't use it so often. Not sure yet how quick and easy it is to fit, and I know it won't look quite so pretty in the front garden (not a problem for you) but the benifits out weigh the dis-advantages.
What ever make you go for make sure it is breathable! Pro Tec have patterns for many vans so can ensure the access door aligns with the M/H.
My cover was purchased by the previous owner who used it and there is no detriment to the vehicle in any way.
A word of caution
I use a cover over my motorbike and the damn thing's rubbed the paint-off on the corners, the same thing's happened on my outboard on my boat. :Angry:
I thought a cover would be a good idea but having seen the outcome if they move in the wind i won't be putting one on the van.
That said, i'm sure the m/home covers you've got will be better quality than the ones i used.
ps Both covers have a lining to prevent paint damage :thumb:
Never used a cover myself, but over the years I have heard more bad than good for using them. Mostly to do with damage that even the best ones cause if left out exposed to the wind. Great inside to keep the dust off, but if you keep your motorhome outside I think its best just to keep it well polished