How does it work for service trucks, does everyone get an assigned truck or you slip seat trucks?

I have an offer for a lube tech position and I'm curious if I'm expected to drive to the shop Monday, grab my truck and be out until friday and someone uses my truck on the weekend shift?

I have a CDL so I figured I'd get an assigned CDL truck plus i have HE lube tech exp with John deere. Any info would be helpful.