Xm radio interference

Absolutely. Had to move the XM antenna out onto the hood of the truck to get reliable reception. Same with the antenna for the GPS unit. Although the GPS worked after a fashion with the camper on the truck it was much more accurate once it had a strong signal.

I thought about mounting both antennas on the roof of the camper but decided the hassle of routing the leads down into the truck and then having to connect/disconnect each time I mounted or dismounted the camper wasn't worth it.