Carrier Air - V heatpump replacement

Carrier stopped making RV A/Cs. A couple weeks ago I had problems with mine and discovered the there were only 3 replacement parts in the country (two remaining after I get mine fixed). I love the design because I can change from heat pump to furnace to A/C, to fan mode and adjust the temp by using the remote I can do it all without getting out of bed. have a front and rear A/C. after I get the front fixed if the rear needs a part I may not fine one. I can buy one of the two remaining parts as a spare that I may never need. If I need to fix the other one in the future I may have to have a wall thermostat installed and it may get complicated wiring up a heat pump and furnace control to the replacement.

Are there aftermarket parts that the dealer was not aware of, and maybe a part will be available if I need one in the future?

Maybe if I am allowed to keep the broken part I can fix it and keep it as a spare.

Or maybe there are other companies that make A/Cs that do the same thing the Carrier did?

I just got this 2009 Alumascape a month ago and it is being fixed under a one month warrantee. So far I love the camper and plan on keeping it for a while but I am wondering what I should do if there is a future problem.