Hi Kate, I will be more positive than most, and say that my party will be glad to get you down safely, and in style, get you pitched, and provide any other help you need!
I am one of DW's party - his offering is exactly what you're looking for - full trip down in one of the first ever Stephens' Esprits ever built, via Eurotunnel, and Maison Blanche camping. His MRI package will also give you the comforts of the MRI hospitality area. He's got a spare seat because one of our number has decided that he'd rather go on a stag trip to Southern Ireland. Having known DW for the last fifteen years, you will be in absolutely safe hands, and if in any doubt, I myself am with one of the industry's governing bodies (I'll give you details if you want to check). I'll be going there and back with a friend by Dover - Calais ferry in an Audi ur-Quattro, if you would like more room! 
That sounds like a good deal -- only aren't you going down on Wednesday? Because the group I normally travel with go down on Sunday, I am flying in on Saturday which gives me four days to fill up ... and the ticket is non-refundable and no changes allowed.
I have a photographer who will be coming down Thursday and will need to camp with me -- he's going to be credentialed as well, in's Allah -- but doesn't need any other aid as he has made all his plans to fly into Paris and come down by train.
Kpy, I can probably get to Le Mans by Eurostar and then TGV, from the look of it, if necessary. The camping is of paramount importance. I can't drive a car; I have lost most of the sight of one eye and even in Canada they won't let you drive if you can't see out of both eyes (even if you choose not to).
If something can be worked out, date wise, this does sound like a good deal. What would it cost?