The solar system you design, build and put on this new rig has to meet your requirements.....but the first step is knowing what those requirements are. Being able to run at least one A/C all night and have some reserve power left over was what we were after. Ours became a 24v system because it's a pretty big system compared to most. Fine, it does what we need and does it well.
Matching the right amount of panel wattage to the appropriate battery bank capacity which will then power inverter/charger(s) is what you'll end up doing. Hopefully it all comes together correctly the first time.
There are shops close to the Newmar factory that can sell and install these systems. Some are "more reasonable" than others. We used Wellspring Components in Shipshewana, In. about 25 miles from the factory. We got a very reasonably priced Victron set up from them. I shopped around, a LOT. Second place was Discount Solar in Quartzite, Az.
2021 Newmar BS3014
2X Ebikes on the back
Almost enough solar