I had a strap snap on me, luckily I noticed it hanging while walking to my truck from a gas station, and was able to limp home with the 1 holding out.
I didn't see anything I'd feel comfortable using at the auto stores, they all had the same generic crap, that in fact looked just like unpainted pallet banding. I found OEM at NAPA for about $50 for a pair, had to wait a few days ,,, Much rather do that than improvise. If 1 gave out, no way would the other chintzy strap hold the load.
Lift bed vs drop tank debate will never have a winner. People do what they want, its a no brainer for me. Dropping a tank is simple, and can easily be done by yourself. Lifting the bed requires extra sets of hands, and messing with 8 bolts vs 2.
Not only that, but dropping the tank lets you see and access the fuel and brake line portion between the tank and frame rail, which is typically rusted to hell and needs replacing.