Posted 11 August 2013 - 01:20 PM
While I don't know much about the technical of chains, the ratings don't seem to ever include a straight line pull. I don't think you would need a chain to match the weight of your truck because you will never be lifting it straight up vertically. Depending what the towing situation is, for example if the truck is pretty much still rolling but just hung up, you aren't really pulling the weight of the vehicle are you? It dosent seem to me like you are actually pulling the full weight of the vehicle unless it is really stuck (like pulling with wheels locked). Resistance applied by means of sand, mud, etc adds to the actual pulling weight and I think a good example is the suction effect of a vehicle stuck in mud or clay. A suctioned in mud 7000# truck will probably need 10 000# of force to actually move. This is all just a theory I have, but to me it seems to make sense. Essentially, people say to buy a winch double the weight of your truck which is supposed to compensate for this, but many times you hear of a guy needing 3 trucks to pull him out, or how a guy burned up a 12k winch with a snatch block on his 6k truck.
IMO, a trucker's chain of 5/16 variety will work fine. I have truckers chains from harbour freight that have lasted longer than any vehicle Ive ever owned. These chains get transferred from vehicle to vehicle in my tool box and Ive towed a lot with them, not to mention using them in ways chains aren't meant to be used. If you think its a tough situation, just double up the chain. These chains are a lower grade rating which are a lower strength chain that use a higher alloy content and are more likely to stretch than break. A higher grade chain is a stronger strength rating but more likely to snap than stretch. Think of it the same way as bolts are graded, a gr5 bolt will stretch before it breaks, but a gr8 will snap before it stretches. In towing a vehicle Id think a lower grade would be better. Also probably another thing to consider, Id guess that the rating on the jack is probably right around the same rating neighbourhood as the chain they recommend using it with and Id doubt that the jack's rating is more than 2.5 tons.
2015 Sierra K1500 SLE Crew 6.5' bed, bronze alloy metallic, Cocoa/dune. Weathertech floor liners, Mexican blanket seat covers, Rugged hard tonneau, Iron cross HD steps, 265/70R17 Red label General Grabbers on 17x8 level 8 mk6 bronze, 235/80R17 Firestone Winterforce on stock alloys.
2007 Silverado C1500HD, Huskyliners floor liners, Lightforce XGT240s and KC hilites, homemade rear bumper, 235/85R16
2002 Sierra K2500HD, lb7 duramax, Red tops, 2" bodylift, 285/70R17 Wranglers, GMT900 LTZ alloys.