Went over twice in the summer, EBI and a family and friends road trip, booked once as a campervan with no issues, second time booked as a high van as it was around £50 cheaper: got stopped and grilled by the French on the way out, they said if I had a bed and/or the ability to cook it should be booked as campervan/motorhome. I explained that my idea of a motorhome was the big Tupperware things, and argued I was the size of an estate car and eventually they let me through, but it was a bollock-ache.