Is a Gas 3/4 Truck and Pop-up Camper Safe in Colorado?

We drive a Gas 6.0L 2015 Chevy 4x4, with Lance at about 2900 lbs plus gear. We've driven all over the Rockies several times over the years -- never have a problem. Drops a little speed climbing hills, but not enough to care about.

Before that, a 6.0L Gas 2003 GMC 4x4, same camper, no issues with it over the years - and lots of trips in the Rockies. IF I ever buy another truck for camping, I'd still go with a gas engine again. Good shocks and HD tires make a difference, we run Bilstein's and BFG 285 'E' tires.