Mo,
The French vehicles are good choices! As long as it runs and is easy on maintenance, then there is a clear advantage. Off-road would be important, too, although most of the time it seems to me that PCs in vehicles tend to still stick the road. (Not all the time, but it seems when they need to go somewhere in a vehicle they need to go fast!)
I noticed something about RCAF's original choices. I don't think there is a "Chevy Roadmaster". There's the classic "Buick Roadmaster" (the same vehicle from Stephen King's
From a Buick Eight). There's also the return of the mark in 1991 as basically a station wagon and then sedan.
Tony