I have a small RV trailer that has almost no room on the roof so I’m looking at ground mounting a couple panels when I get to destination. I am trying to decide if I should get an all in one or builder with individual components I’m currently looking at a 12 V system that I can top off or charge from a generator or my truck. I already have a Renogy BT 20 amp MPPT but I need some kind of an AC charger and I have a 30 amp Orion, DC DC charger. Looking for some suggestions.