It may look fun, my sons best friend in alberta where they both live is a diesel truck mech and does some heavy equipment work. It costs thousands while a machine sits idle so nobody goes home till its back in service . And they never break down on a sunny Tuesday in july, with the parts you need in your service truck. And you don't tow anything to a shop.
I think I mentioned earlier, its cold desolate and expensive.
My dad was a maintenece director when Sheridan College had a heavy equipment operator /diesel mechanic school. They graduated a lot of guys that could fix a problem in the happy well lite shop, when you told them the problem. In a 30ft deep ditch in the mud in February at 3am on your own,.......