I’m sorry for your losses….. life can really suck sometimes. At least you are trying to make the best of it.
Sounds like your coach is prepped for solar so you should have a solar controller in your coach now that would look something like the picture I’ve attached.
If so, you could plug in extension cables to the MC4 connectors on the roof and then run them down your ladder and secure them with zipties from the top down to the bottom. You could then plug a portable panel into the cables when you are parked.
Whether it could charge them full depends on the size of your batteries, depth of discharge and the power output of the solar panels and charge controller.
I would then buy these to use as “caps” to plug into the cables secured on your laddet to protect the connectors from water and dirt when traveling and not having the solar panel attached.
Renogy One Pair of 9In 12AWG Adaptor Kit Solar Cable Wire PV
https://a.co/d/6aB9yFV