I contacted FWC, and they said there is a 4" wide aluminum "beam" that goes around the camper where the soft walls meet the hard walls...they said as long as you drill the mounting holes in the beam you are good...no electrical wires inside beam etc. I bought SS bolts, washers, lock nuts etc at Lowes...and rubber "fender " washers, the big flat ones that were same width as the ss washers. I then marked the holes, crossed my fingers, and prayed I drilled straight, and not at an angle...all the holes were perfect. Then mounted the brackets with a rubber washer underneath the ss washers both inside and outside the camper wall. I believe FWC said the walls are 1.5" thick. The brackets come with 2 hitch pins to secure them to the bracket, I found some padlocks at walmart with the long shank that fit perfectly through the hitch pin hole...so I can lock them...I have 2 sets of these brackets, as I have the Ironman 4x4 8' awning on the passenger side, and the Kickass brand shower tent on the drivers side. I have a 2022 Hawk with the smooth aluminum siding.