hi there and welcome to the forums!
great to hear another 59 being restored and very happy to hear you going the solar panel route.
I have an idea or two about how/where to configure the solar panels and batteries. But first...
Do you plan to travel? Tongue weight is a concern for your tow vehicle's hitch and 4-5 deep-cycle batteries (60 lbs each) will most likely double your tongue weight. May want to consider distributing them in the cabin. And don't you want to hook them together in parallel for max battery life?
An 85-watt solar panel usually means a 5-amp max current for 12v
DC power. Often panels are listed at maximum capacity, which means they may produce 17 volts during peak solar hours at a max of 5 amps (17v x 5A=85 watts). Typically you can expect 60 watts from them, enough for an incandescent light bulb, or many LEDs.
To simplify: are you planning on creating a 12v
DC system, a 110v AC system, or a combo?
I plan to do something similar with my trailer, as soon as I can get the stinking plumbing system out of the way, so these are questions of curiosity.
'til next time Earthling...
p.s. Tuesday night was an incredible night for solar flares. That means yes, there actually *was* a disturbance in the force.