Take a look at the Roadmaster 195225. It is rather pricey but is very nicely made and will outlast two or three motorhomes. It is designed to allow the spare tire to pivot down out of the way. It’s so you can lower a large heavy tire to the ground without lifting it but it should solve your problem. You’d need to devise some kind of lockout or “remove before flight” flag on the slide switch so you don’t forget to lower it before e tending the slide. It would be pretty easy to add switch and relay on the carrier pivot to make the slide inoperative with the tire raised.
__________________
|