Just had my septic tank pumped. The truck holds 2500 gals (20,000lbs). It weighs another 10,000ish for a total of 30,000. The truck broke down at a valley in the road (both ways up hill) after leaving my house. I hooked up my chain to my 04 150 SCREW, put it in 4x4 low, and pulled him backwards up the hill and out of the way. No sweat, no effort, the truck didn't blink. The two chains, however could not released because so much pressure had been put on them.