well, with two big pickups arguing and yanking on each other, the chain will either: break itself, or break important stuff off those trucks, or both. it is quite possible that one or both trucks in this scenario will end up somewhat trapezoid-shaped afterwards.
10,000 lb rated nylon strap is basic for trucks rescuing trucks (or trucks rescuing cars too), if in doubt more is betta. for the big straps like that, look for looped ends instead of hooks and loop the loops over trailer hitches or shackle onto tow points of towing/towed vehicles..
With winter and snowbank-surfin' season coming up quick, I think this subject deserves its own thread, moderated by Pedro and Ty.