My application was equally vague as I had no specific trip in mind... The permit took approx 3-4 weeks to arrive. For anyone hoping to make the submission the rather long winded email address to send it to is:
dtpp-sddep-brep-transports-exception...erieur.gouv.fr
My application included the form
http://www.prefecturedepolice.interi...lisurfaces.pdf, a scan of my license, passport, and last 2 pages of the log book... no questions asked, et Voila
I didn't use it in the end on a recent trip to the Alps, but I hope to in the future (now that i've scouted out a few Chateaux's)