Use your own vehicle, but it must meet their criteria, which for my route is 4WD, 90 cubic ft of cargo space, and model year 04 or newer. Therefore, my primary is a 2005 Durango. Spare vehicle can be whatever, as in my 83 Jeep 2wd.
How does the Durango work for you? I used a 2000 Durango for a while and it used A LOT OF GAS do you have sux peddles? Or can you manage to stretch over?