That truck is just to be handy since it doesn't have a rolling tail board or it doesn't have weight in the front as it's a gas engine, it's also just a 1 ton. Previous owner had a welder and a torch on it and probably repaired things, changed electric motors, picked up scrap, etc.
Trucks with a rolling tail board, which are "real winch trucks" can pick up, load, and transport all kinds of big things such as tanks, pumping units, floors, etc.
I got that truck for $300 with no rear axle and they cut off all the winch related things. You can also see the big hole behind the cab where the torch bottles holder was where they cut that off.