Just follow the truck around until it comes to a stoplight, then affix C4 to the doors, retreat to a safe distance, and blow the doors. You can also wait to blow the doors and keep following until you get to a more suitable place for the explosion.
Just remember that nearby cars will cause secondaries, so make sure that you're far enough away from everything. Blew myself up twice because I underestimated.
I would have shot hinges ! and that was only a 2 star ? michael mowed down cops ? well that's okay by me ..hahaha