I made a frame for helping remove/re-install the box of a pickup truck:
It's pretty simple, although a bit large, but it works like a charm. I ran remove or re-install a box in 5 minutes by myself. I had to do something after I damaged my box a bit when I tried removing it myself with the skidsteer and some chains.
This is another simple tool for helping cut holes in steel with a torch. Just a few large flat washers welded together.
3 different sizes welded together works out nicely. You always have it clamped to the steel so that the hole you want to use is raised up off the steel surface a bit.
Then you put the torch in and simply use it as a circle cutting guide.
It works, although finding the exact hole size you need may take a bit of trial and error, depending on your torch and how well you operate. Naturally, you won't cut a 2" diameter hole if the washer's ID is only 2". You would need slightly larger washers than the hole size you intend to cut.
Of course I can't take credit for the washer jig, I found out about it because of a welder at work. He told me he learned about it years ago from another welder.