fyi, i have 2500 laramie WITH sunroof and a FWC, not sure how the overhang compares to a TC650, but sunroof is not blocked and functions perfectly. its close on the pop up vent mode though, im trying to not use that function. dont think it would hit when the camper flexes, but rather not find out. heated seats were wifes #1 priority, sunroof was up there on my list bout "could" have lived with out, glad im not. i originally went after a big horn or outdoorsman, glad i got the laramie (truthfully i started with power wagon, but no cargo capacity killed that quick)