I'm new here, stumbled across this thread while searching for info on Jayco roof repair. I have a 30' 2006 Jay Flight and was in a situation similar to yours - wanted a smooth ride in a 1/2 ton truck. After researching, I settled on a 2017 Chevy Silverado 1500 LT Z71 4WD and have been very happy with it! Need to keep the speed max around 60mph in order to get 10-11mpg, tho. BUT - I live in relatively flat territory and haven't traveled the mountains with it yet. Still not sure if I'll use this truck to make an Alaska trip in 2022. Great daily driver and flat land TOAD, maybe not so much for mountains!
SO - here's the scoop - get a great education at https://rvtowcheck.com/ - or http://fifthwheelst.info/app/rvtc-v3/ - download their app and don't cheat the numbers. There's more to this than you'd think! I got lucky with this truck, actual rated GCWR of 15,000, GVWR of 7,200, payload 1,748, max trailer weight 9,200, weighed in at a CAT scale at 5,580 empty with heavy weight distributing truck hitch on and full fuel tank. 5.3L gas engine with 3.42 axle. Jayco rated the trailer at 5555 dry with hitch tongue weight of 755. Actual CAT scale trailer weight empty but with bedding, one 1/2 full tank propane, two batteries was 6,160, CAT scale tongue of 980. According to Real RV TowCheck with these real numbers plugged in, using the safest 15% tongue weight parameter my truck can handle a maximum trailer weight of 7,466 pounds with all real weights plugged in. Using the marginal 10% it can handle trailer weight of 8,920 pounds. Power was fine but fuel mileage sucked. BOTTOM LINE - RESEARCH BEFORE YOU BUY! DON'T GUESS!