Where the truck is sitting is tilted up by hydraulic rams, and there are ramps that must be assembled/attached. The towed truck is then winched into place, though I guess you could drive it up if you had oversized testicles.
Stay safe, Steve
1946 Chev 1/2 ton - 6V/+ground/Bias-ply original - shake/Rattle and Roll! (SOLD) 1940 Chev 1/2 ton Franken/Restomod