Its on the ritchie bros auction in chealis wa, coming up in october. Its listed in the crane section as a 15 ton crane, but I'm not sure what it was built for? https://www.rbauction.com/1985-hamp...Id=11568565&id=ci&auction=chehalis-wa-2019241 Is it a mast unit for logging with a separate winch unit? Or is it some kind of powerline assembly special built equipment? Google came up with one listed on crane network from a auction, and gives a description and some more pictures, but I'm no further on understanding what it was built for. "1985 Hampton Engineering TL 3013 All Terrain Hydraulic 15-Ton Tower Lifter, Perkins diesel, powershift, with rotating and sliding tower deck, four telescopic tower attaching points, all-wheel steering, 4 hyd outriggers" https://cranenetwork.com/equipment/23235
Looking at decal outline, looks like it was owned by pacific gas and electric. If that gives any clue....