terrifyingly wired up with, like, cut up extension cords and chewing gum
They don't own the truck. Chewing gum won't vibrate loose; It can be uninstalled quickly for owner inspection and maintenance; It's AC low amp with a fuse: a reasonably safe and cheap hack job.
The rare owner-operators have the authority and income to make wiser long term choices.
Your comment's so edgy that it's illegal in California.