I've been working extensively in France for the past couple years, and a US width RV would be a serious challenge in a lot of places. I've seen a few Silverados and F150's, and they're absolute monsters compared to just about everything else on the road. The half-ton pickups take up four parking spaces. A 9m class C? You'll never make the turns in most parking lots... Overhead clearances will also be an issue when you get beyond the Autoroutes.
You'd be better looking for something built for the market. The only place I'd consider taking a US built RV is Australia. Their roads are much closer to ours in terms of widths, and they have larger vehicles...