I've done this twice. Removing the drive shaft gives you more room. I found that not lowering the gas tank makes twisting the new straps in to be impossible. less gas in the tank helps to lower it. Don't forget go unscrew the filler neck from the bed.
Holy crap, this fix sucks without the proper equipment. Had to find some media to help me out. Just replaced mine yesterday, ended up using two scissor jacks to hold up the tank because I don't have a floor jack. Thanks for uploading this bud