No make or model suggestions unless your units are Carrier Air V's
IF they are carrier Air V's. and IF YOU CAN GET THE ADAPTER KITS
Coleman makes a replacement rooftop unit that can be adapted to your existing controls (So does Advent Air but I have one of each and like the Coleman better)
This way you change NOTHING inside the RV.
Big if on the adapt-a-kit however.
Otherwise.. Most of them are more or less equivlent though Advent Air is made in China and is a witch when it comes to preventive maintenance.. I've not yet PM'ed my Coleman (it's too new) but from the exterior design I think it's going to be way easier.
On the Carrier.. when I went to clean the condenser every spring/fall.. I removed screws and other connectors
On the advent air I have to remove metal tape and bend tabs.. at least till I get around to screwing it......... together (Next cleaning more than likely) .