Yes they are mounted from the roof. Remove the cover and you’ll find 4 lag bolts that mount it to the roof. Use a heavy sheet of cardboard or plywood to set the unit on so you don’t damage your roof. While you’re in there, get some good duct sealing tape (not regular duct tape) and seal everything up after you vacuum out all the sawdust the factory left in there. You’ll be surprised what you find in there.
2014-3950, Full Paint, 17.5" tires, 370W solar, 3100W Magnum inverter w/ AGS, 7500w diesel generator, Micro-Air Easy Start 364 (x3)
2019 Ram 3500 Limited w/ Max Tow pkg