New Horizon's offers a mini split as OEM now. https://horizonsrv.com/why-new-horizons/interior-systems/
There are several videos on youtube of people installing DIY mini splits in RV's as well. I like the idea, as they cool more efficiently, heat with electricity, dehumidify, use substantially less power, give you a lower profile roof, are quieter and more effective.
The only possibly downfall that I am currently seeing is the inability to cool multiple rooms. My camper has a rear bunkhouse and a front master bedroom. With the doors closed for privacy/light, it would prevent the even flow of conditioned air. Putting a cassette in those areas would take a LOT of space and would be overwhelming cooling/heating power in such a small area.
