As I understand it, European RV's usually don't have a lot of our standard amenities and they use them differently than most Americans. Here is a link from
The Fit RV.
To summarize, they don't have generators, microwaves or a black water tank and AC is unusual. They also are used more for shorter weekend trips, mostly smaller because of roads and weight is a big issue because heavier rigs require a different drivers license. They say the rv's don't have "the big inverters", it wasn't clear if that meant they had smaller inverters.