Bought these luggage racks to replace the damaged ones on our Ford F150 FX4 camper body. Installation was quick and easy and they worked as intended. They support the RV window perfectly. Tip: One thing we learned installing the second post was that you cannot completely remove the end clips prior to installation. Simply slide it back about 50%, place the end of the pole on the ball mount, and then slide the clip back into place to secure the pole.