Just sit in the hole with Jenny and keep shooting the windshield of the truck you will eventually get the driver if you leave the hole he will run her over right away if you stay in there she will duck with you.

no he doesn't. Jump on the van and keep whatever gun (preferably full auto) on the driver's window. Try to get in on the side of it on it's second run. If not, just spray n' pray on the third run. If you don't get it the first time, keep trying.

Just sit in hole with jenny then press 'Y' for lynch to attack driver then just shoot at windscreen and he is DEAD deed done