I'm rebuilding my trailer, but i'm going with two DIY 12v 100ah Lipo batteries. Just one battery currently on sale for $137 ea (DUMFUME brand). That's over 2400 Watt hours with 400 watts of solar input in parallel. 2 built in DC ports, 2 USB ports and an external anderson port to connect the trailer lights and appliances. I will probably add another power bank to that later to get me up to about 5k Watt hours. Just over kill, but if I need it I will have it available.