@PCO6 Good good job repurposing your kayak lift! The shower rod setup we're using was a removable one bought off Amazon. With the textured finish of the 2020 models the suction cups wouldn't grip, so purchased some flat adhesive backed plastic circles used for mounting cell phone stands on dashboards. That worked very well even in windy conditions this past weekend.
Here's a few pics of our camp setup this past weekend at 2021 Jeeping with Judd. Our friend next to us is using a Weroll trailer that he's built into a pretty lightweight camper.