as far as straps go, you want to get a dynamic strap, one that will stretch as you pull it, this puts the immediate jerk on the strap, not your frame, this causes less damage on any component that's being pulled, after that, the strech will return and pull the truck, it's like doing a bungee run, if you've ever done that, try to run with a big bungee cord on your back, see how far you can get before it pulls you back, and it WILL pull you back...
also, it's important you get the right size strap, too small and it's going to snap on you and leave one truck stuck, and no strap to get it out with... too big and it's elasticity won't be noticed and it will function like a static strap, or like a chain... you need to find one that fits YOUR vehicle, even if you are pulling out a unimog, your vehicle still only weighs what? 3600lbs? don't worry about the unimog pulling other unimogs, he should have his own straps for that... worry about what's best for your vehicle's weight (if you want to carry extra straps on top of that one, then that's fine...