ok, I was staying out of this until now. My 5.7 Tundra pulls my 8k+ trailer just fine. I've been thru Colorado Rockies and up and down the the east coast mountains. On average pulling the camper 2800 miles a year, for the past 6 years. I've never had a bit of trouble. 77k miles, no oil burn, ok gas mileage. Great truck. To compare, I had an F150, and drive them at work, but none with EB.
Bottom line...If I started over, I'd do it all again. With one exception, if I was going "full timed" with a large 5ver, I would make it a diesel.
2000 Cherokee 29BH with 6V batteries, LED lights & 400 watts of solar power, flipped axles and raised. 2007 Tundra 5.7L DC-LB with lots of mods. C-co, 8/158th AVN Maint.