We use the Bard units on our potable office trailers and classrooms all the time, However they are fairly heavy, draw quite a bit more power, and make more noise and vibration than the mini splits. Biggest advantage for us is they are self contained, no refer piping to deal with and cheaper. All but the smallest (12,000) btu are set up for a supply duct up high (usually in the attic or above a suspended ceiling, and a return grill through the wall. They work great on the larger race trailers with either shore power or big gen-sets. One other drawback is if you four season camp, the heat pump portion does not work well in cold climates, needs to have the auxiliary heat strip option that will add an additional 40 amps to the power requirement.
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