What do you think the frantic behavior stems from? nervousness, or does he get so hyped up to be going somewhere "drive"?
Have you tried just hopping in the truck and chilling out. no driving just hanging out, pet him maybe give him some food. then exit the truck and put him up. work on length and eventually starting the truck. with an end goal of being able to drive with him being calm. Basic desensitizing.
Athena BH, Rosko BH
I MAY NOT BE THERE YET. BUT, I AM CLOSER THAN I WAS YESTERDAY.