I'm pretty sure I have (it *was* a long time ago!). It may help to take the ramps at an angle and obviously go slowly. The angle of the ramps depends on the level of the tide. They have planks of wood there if necessary.
I had no problems, but the Ferrari in front had a hard time.
Pretty sure you'll be OK. The exhaust is what you should watch out for as you get of the ramp (if going out front first). They have all sorts of planks and mats so make sure they use them. Enjoy the drive!
Thanks guys, I e-mails Hoverspeed and they said they had not had any probs before. Just didn't want a cheap weekend in France to turn into an expensive one!