So we did the install. Went with a 3000 Watt True-Sinewave inverter, 4 trojan 12V batteries and 4 250w 24v panels. Found a good installer locally, he did a great job. He ran the solar wires down through the refrigerator vent. The batteries were installed in the front panel where the spare tire goes. He moved the tire to the bottom of the trailer, so it leaves room for my two Champion Sine-Wave generators. We used the panel the old batteries were in to house the charger and circuit breaker. Went with an outback 60 charger. Running 2 sets of 2 panels into it, so the voltage won't be exceeded. If i find i need more panels, I can add 2 more to each series, and another outback charger.
The panel choice runs great in low light, which is the reason for the higher voltage panels. I ran 3 of these panels with the same charger on my older 29ft trailer, and boon docked for a week in mostly shade and never was without power.