If the tires were filled then there is no way that truck had enough power to spin those plus pull a 923. It takes alot to spin a 400lb super single with 650ftlbs. There is not enough mass present to accumulate 35,000lbs. I haul alot of trucks and equipment and That truck is no where near the weight of a D6 or two SEEs combined.
Sorry about getting embarrassed by getting pulled around by those things but given the fact you said you had not read the TM on backing up in reverse tells me that you don't know how to operate the truck to its max potential. Heck an A2 truck can move 218,000lbs. While an 855 would ask for the 218k and some.
Fyi its easier to pull against 2 trucks hooked in a line together than seperate. Once the chain on the rear and front of the one truck is tight then the force from the chain pull goes thru the truck body to the other chain actually taking traction off the ground. Dont believe me, put a half ton truck in the front with a samuri or a wrangler in the middle they will actually flip over on their roofs.
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