Yeah, IMO it sort of scales . . .
Infantry- ambulances of various sorts
BA- maybe large ambulances, but more likely the 10 ton trucks- especially if you fluff a light crane, same sort of truck that would be used to reload armor and maybe mechs
VTOLs- wreck probably gets stripped at site due to 'truely destroyed' but might just be a wreck for the game so a heavy/large truck, a battlemech recovery vehicle (50t) from TROs
Hovercraft- same sort of thing as the VTOL though if you wanted to waste a Tonbo on it you could. It would be interesting to see if you could put wheels under it like they do to tow some vehicles
Wheeled- wreckers, heavy trucks, battlemech recovery vehicle or heavy BMRV (70t), or towed by another vehicle
Tracks- wreckers, heavy trucks (lowboy), BMRV or HBMRV, or towed by another vehicle, Tonbo
Mech- wrecker, heavy truck, BMRV or HBMRV, towed by a armored vehicle, drug off by another mech, Tonbo or a specialized salvage mech like a Hyena.
Now, some ideas . . .
Either a 2.5t or a 5t truck base-
using a HMMT as a base-
Using the replacement of a the 2.5t truck-
I think a MRAP based wrecker, its armed from what I saw-
M88 Recovery vehicle-
I found pictures of it lifting a M109 paladin off the ground, it also was assisting in raising buildings or building fortifications.