That kind of work is a young person’s game. I spent a few years wrenching on cars and also in construction. It was awesome, because it motivated the crap out of me to go to college, get a good degree, and not have to do that kind of work for the rest of my life.
Everyone I know that is older than 40 doing that stuff, is either trying to get out or is the owner of the company and has young guys tearing up their bodies for them.
Anyone that would voluntarily leave something a sweet as a RJ CA or higher for that kind of work is in for a MAJOR reality check.