I was at the Hershey RV show earlier in the week and talked to a manufacturing rep for Columbus. I was asking him about minisplits. He told me that they are in talks with a manufacturer and may move towards those in the next couple of years. We had been chatting about some other things for a while before I asked about the minisplits, and other people were in the camper and wanted to ask questions, so I didn't push it any further.
I would MUCH rather have a minisplit with 2 heads (I'll take the traditional cassette heads, it was a 5th wheel we were looking at) over 2 or 3 rooftop units. Cheaper, less invasive on the roof, heating and cooling, quieter and less power draw. I'll be anxiously awaiting...