Try your local equipment/truck dealer, for a general idea. You might even find someone who knows about that particular unit. You might be able to email those pictures and get info on a comparable new unit. Can you get the dimensions of the unit? length, width, cylinder dimensions. Someone in the towing or truck building business might be able to help you in a general way, close enough so you would be able to move ahead. Looks like a pretty big unit, I drove a 26,000 gross weight roll/tilt for a couple years and that looks like it might be bigger. I have no idea what the truck itself weighed.