All fuel cards are kept with the truck and if you switch trucks, the fuel card stays with the truck.
We use PetroPass (Superpass) card lock in Canada and not the US. The PetroPass card is not valid at Petro Canada gas stations, only at SuperPass Card locks. We require all drivers to fuel in larger centers as fuel is a better price than the smaller ones.

In the US only we use T-Chek, which are valid at all major fuel locations such as Flying J, TA, Petro, Loves ect. These card are only valid in the US and not to be used Canada.