Several observations.
I used my 13.5k AC from an extension cord off a 20A GFCI at least 100' away and 30A to 20A dongle. The generator must be a proper inverter type not a construction genny. I can start and run my 15K AC with a pair of Honda EU2000's and can run it on one of them. A soft start kit (no idea where hard start came from) will allow you to run and start a 13.5 from a 2k sine wave inverter genny. For batteries, get 2 Trojan T105's. They are proper deep cycle batteries and have 225AH. They are 6V so must be wired in parallel. keep them on a smart charger when not on shore/house (same thing BTW) because the built in converter on a trailer that old will not likely have a proper charge profile and the wires are usually too small and too long. Off season I brought mine in the basement and put a proper battery maintainer on them overnight once a month. If a battery is labelled as deep discharge AND also has a CCA or CA rating it is NOT a true deep cycle.
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