The smallest one they show is 9000 BTU, which translates into something like 900 watts, although power consumption is not given on the web page you link.
That would require something like 100 square feet of solar panel, assuming you are getting high-quality direct sunlight. If you want to power it during the non-peak flux hours, the number of square feet goes up.
That's not counting losses due to converter inefficiencies, cable losses, etc.
Existing two roof units are 13,000 BTU each, so I was looking at the 27,000 BTU but with three ceiling cassettes, I understand that just two leaves the front of the coach hot or cold, as the case may be. Solar array would be on the large side, I understand that. With the roof cleaned up due to losing the two roof units, maybe there’s enough real estate up there for four of those Kyocera 285 panels? I’m just knowledgable enough to get myself into trouble trying to force the issue, lol. Does sound doable if willing to forego A/C at night, should be bearable with dehumidification and blowers moving air.