[folivier]

Yes, please post pictures of your mini split install. I'm curious why you went with a 240vac unit rather than 2 120vac units. Would 2 compressor units not fit in the basement? The only issue (for me) would be limiting yourself to 50 amp hookups or generator use. 30 amp wouldn't supply the 240vac to run the ACs. Just thinking out loud here.
How well does the mini split cool your coach compared to the SCS? I'm sure it's much quieter but does it cool as well?
I like the idea of using the existing ducting and a circulating fan to distribute the cool air!