Best for Alaska Hwy trip my OEM 20" rims or get 17" rims

MY TV is a 2007 Dodge Ram 1500 5.7 V8 with the 3.92 rear end, a camper top and I tow a 6000lb camper trailer. When we travel the truck is pretty close to it's 13K GCWR. The truck came with 20" rims a...