The group that introduced me to this game said that you don't have to pay graft for the small truck you start with.
As I read the rules (5a) states: Pays Driver Graft of $1G per Small or Medium Truck...
So, to me, you have to pay for the small truck every turn.
OK..wait a minute. Our FLGS has a copy that we broke open last night. First time play for all of us. By the wording of this post, am I to assume we missed a rule about a different Graft price for a large truck??
If so, well...I'll just add that to the list of other things we missed. We had a good first time play though.