Yeah that's an option too, my only problem with that is I'm vertically challenged lol. Might not be able to reach it back there. I did find a tailgate trash bag that unclips and folds down when the tailgate is down but they want almost $300 for it. $45 Trasharoo will do lol.
One thing I forgot to mention is I'm in the market for a fridge cooler to strap down in the cab. I have an AC 110V 150W plug inside that'll keep a fridge running while the truck is on, and I bought a 100w portable power bank that should keep one running long enough when the truck is off. Amazon has a million of them for relatively cheap i just need to take some time to research and review.