Search:

it depends. If this were a regular passenger car, a body or frame shop would put it on a frame alignment machine, chain it down, and start using factory diagrams of what the frame should spec out...

Minimum, I would put the frame on an alignment rack or frame jig and make sure it is straight. Funny things happen in even low speed wrecks, and if the frame is tweaked, nothing will line up, ever.
...

Wow. So sorry to hear about your Dad. Was it some mechanical malfunction, or just a traffic accident?

Whatever you do, scrutinize every component on the car very carefully before reusing any of...