There are a few US RV's for sale in the UK and Europe, but they are getting fewer and fewer these days because of the quite ridiculous import duties applied to imported American RV's which is a real shame as the European equivalents are in our opinion significantly inferior.
We pretty much fulltime in our Winnebago and with that in mind we were lucky to find a Winnebago Vista 26p which at 26 foot and change, with a short wheelbase makes it very maneuverable which helps with most campsites that are setup for European motorhomes which tend to be smaller.
The only real problem we have faced really is in regards to our height, being 12 foot means that there are a lot of overhanging trees on campsites that smaller European RV's can get in under. but with a little research and google street view it's easy enough to work out if a campsite is feasible or not, we have also had to get out and inspect a couple of medieval french stone arch bridges off the beaten tracks to work out if they can take our weight, but I guess well fed French knights in plate armour on giant horses were what they had in mind when they built them
We definitely seem to be a bit of a curiosity when we park up on a campsite, the twin slides and hydraulic jacks are non existant on European motorhomes, which tend to be built on van (under 3.5 tonne) rather than a proper truck chassis and a Winnebago seems to get peoples attention because pretty much everyone in The UK or Europe equates Winnebago to an American RV, as it's such an iconic brand.
Maybe we should start charging 10 bucks for a 15 minute tour