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So I decided to go with a 24V System.
There are so many 24V Truck appliances (A/C) and very little 48V system support. Further my highest future load will be an A/C unit with around 1500W, which is fairly easy at 24V. Further I decided to keep the 12V RV system, with it's batteries and converter and everything. The converter draws only a few amps a day to keep lead batteries topped of including the Chassis battery.
I know keeping the 12V system including batteries is redundant - but I'm a prepper and so, the more layers of redundancy I can fit in with little cost - I will do. That also leads me to choose 2x 24V batteries in stead of one large 24V.
I can fit 4 large 40x 80 inch solar panels on my roof - Just have to get flat vents. And find them local, or buy a palette.