My grandfather was a union hard hat. IUOE< douglas_hunter >
He drove a personal automobile to work, not a pickup truck. My father was a Dept. of the Navy electrician. He drove a personal automobile to work, not a pickup truck.
The moral of the story is, if you don't want your employer to try to put your personal vehicle to use on the job, drive a car to work, preferably a gas-sipping econobox.
Your employer is richer than you are. Let him supply his own fleet vehicles and fuel for the job.