Thanks for your input again
Im pretty sure that they will fit as I did once take some photos with measurements (just not the height of the transom). Im pretty sure that the airdeck will clear.
The wheels are secured by springs not gravity. But yes, I have already though about what happens if the spring fails.
I don't think storage will be an issue. They do bags to fix over then wheels to prevent contact with the boat material and the bag is so loose a fit plus the cone ends being to the side of the wheels, I don't think they will add much bulk.
Between launch site and storage site is 200 yards, two locked doors and flights of stairs. Don't really want to leave boat alone whilst I return wheels to where the gear will be stored.
So you can see that I want to exhaust every avenue with these wheels before I ditch the idea of them and start considering options for importing some Beachmaster wheels. Ironically Ive spent alot of time in NZ and have family there but no trips are planned in the foreseable future. The problem is, until any wheels are seen in the flesh, I just cannot be sure on final suitability. I did check out an alternative of the Zodiac wheels and they really did not fit the bill at all. Even though the German company have enough faith in the wheels and their german engineering quality to offer a full money back 14 day warranty. Unfortunately, 14 days and 4 holes in the transom is too much of a risk for me to take at present and Ive got a couple of months before I get chance of going near water.