Mainly the only electric stuff would be
1 iMac, 1 macbook pro, mini fridge, heating water, and occasional chargers/other stuff being plugged in.
How much solar power would I need, and how much would it cost?
I would recommend this popular book, RVers Guide to Solar Battery Charging. It includes all the information you will need to investigate, decide, size, select, purchase and install solar components or a packaged system in your RV. It’s a must for every RVer who wants to go solar powered!