Had some second thoughts. We typically have a light weight 4 step tied on as we always have a trailer or a towed. When parked we put on the 5 step which with triple side rails is much heavier. I would if possible drill thru mounting bracket fastened to the camper and use thru bolts of at least 5/16" or 8mm and as large a fender washer inside the basement that would fit. Don't remove the bracket to drill it as they are just lag screws going into a wood backing in there. If you do have to remove it put something on the screws to keep then from backing out.
