The solar thing I believe is for CA to keep the house battery topped up during periods of waiting to be rented I did find a manual somewhere I think it came with the air conditioner from coleman it's basically a waste of space at only 5 or 10 watt
I ended up putting 400watt panels on my majestic best upgrade I ever did I also snuck a inverter and 125ah battery under the bed as the one on board battery wasn't enough
Tranny would be a snap to change if paying to do it I'd say 4k to 5k engine would be a bear and would 10k 15k would be my estimate if doing yourself half or less of that
