The new FSR Trailer Tower System is available in two sizes: one with a 36" side panel and one with a 49" side panel.
The 36" size is designed for the Freespirit Recreation High Country 55" and High Country 63" rooftop tents. The 49" is designed for all other Freespirit Recreation rooftop tents.
The side panel gives a solid surface with rigidity and gives space for adding accessories. The crossbars are longer and adjustable side to side so if you want to carry a kayak you can have them longer on one side to accommodate the kayak.