I added a power inlet to our 2015 23D International Serenity in front with a real transfer switch with contacts. (really cheap of Airstream to not put one at least on the International trim line of the 23' models for the multi thousand dollar price differential).
The Honda 2000 watt generator gets it's propane from the front outlet on the "A" frame. I made a six foot #10 cord with Furrion twist-lok fittings to go from the one generator with the twist-lok fitting to the trailer. If the second generator is added, then the full 30 amps would be available with a external propane tank for the second generator.
WBCCI Life Member 5123, AIR 70341, 4CU, WD9EMC
TV - 2012 Dodge 2500 4x4 Cummins HO, automatic, Centramatics, Kelderman level ride airbag suspension, bed shell
2014 31' Classic model 30 twin beds, 50 amp service, 900 watt solar system, Centramatics, Dill TPMS, disc brakes, 16" tires & wheels