I had a friend in Florida that used one. He was an older guy, in his early 70s and in good shape at the time. I envied him at how easy it was for him to load his Hobie Outback on top of his full size SUV with the Hullavator. Don't know if the thing held up in the saltwater environment but he was one happy camper with it. Considered one for myself last year but decided to go with a vehicle that it wouldn't work on.
A good rule of angling philosphy is not to interfere with another fisherman's ways of being happy, unless you want to be hated.
Zane Grey, Tales of Fishes, 1919https://vimeo.com/73372194