Old offroad toy: Custom sandrail frame, 1600dp T1 VW motor/trans, on my little flatbed total wet weight was 1975 lbs.
Towing my quad and a friend's dirtbike:
And then my Outlander, and the girlfriend's Eiger (this flatbed is 2X2X.25 angle iron) with a total weight of 2400 lbs. Netted 18mpg at 70mph just over 500 miles round trip to the Oregon Coast sand dunes called Winchester Bay.
edit: factoids: UHaul hitch for $75 second hand, cut and modded (gusseted and supported when notching for Stromung exhaust). Car is on Eibach ProKits (wagon spec) and KYB AGX's usually on full stiff. 225/50/16 with rear lips rolled, no rubbing at all. On Kartboy stock length hangers 2 on the muffler only, all other hangers stock.