I haven’t been able to answer this question either. A 17 ft kayak hangs out more than I’d like forward of the front bumper hitch. I’ve seen some shorter ones up there though. I think Florida DOT gets excited about anything protruding more than 4 ft beyond the vehicle. For me that means two kayaks 17n ft or longer. I really don’t want all that stuff hanging out there cluttering up the view of traffic signals, mountain views and over pass signs. Then too I’ve forgotten stuff in the kayak and had to get up there to get it, fasten it , etc. Do you want to climb up on the hood? … I think we are going to up grade/replace the bumper hitch trailer with a little longer unit with some slides. Loading on the truck rack is tough enough sooner or later the old people will need other options.
Freya Hoffmeister carries seven kayaks on top of her motor home. Of course she can jump up there in a single bound and get them off with no trouble.
Of course the other option is to continue to haul the kayaks on the truck. Sell the trailer. Replace trailer with a Class A diesel pusher and tow the truck. :o I know.
Of course the other option is to get a customized toy hauler fifth wheel with an 18ft well projecting in the cabin off set on the side for the kayak. Not a complete square garage. I’ve though of this but for me that means two kayaks, stacked? But once we arrive we have to unload and then load on the truck for transport to the water. Too much handling.