1) Folding boat: I know this isnt a kayak but those folding boats that are always shown at the RV shows have proven themselves over the years to last. We have two kayaks we carry on the roof of our toad but the foldaboat may be an option for you...I've even seen them tied flat to the wall on the driver side of a motorhome..just another idea. Porta-Bote also known as Portabote, Portaboat. Folds to 4 inches(11cm) Flat
2) Rack fabricator: Brian Postema
"We have a rack for that!"
Ask him to send you some pictures of the racks he has built for kayaks to mount vertically on the back of motorhome...
Personally, we didnt opt for the "mount on the motorhome" approach because A) we wanted to be able to have them on the toad and drive to the water from our campsite
and B) we wanted to be able to take our kayaks on our car (honda element-toad) to local rivers when at home and not motorhoming.