I have 5 boats here in our Pocono house, 3 in the garage and 2 on skids covered with a tarp. I upcycled the 4X6’s and bought the pressure treated 2X4’s. I can now fit 6 boats on this rack. I painted it to match the deck.
Mine is basically the same but one sided because it is against the garage outer wall. My boats rest on nylon straps across the cut outs of the arms.