OK, here is the deal. If you plug your new trailer into a 50A outlet with neutral missing, you burn up most of your AC devices with 240V across them.
I have two trailers with 50amp service and both have hardwired Progressive Industries EMS units with remote panels that I installed myself.
I highly recommend this device.
https://www.amazon.com/Progressive-Industries-Hardwired-Electrical-Protection/dp/B003AN1UA8/ref=asc_df_B003AN1UA8/?tag=hyprod-20&linkCode=df0&hvadid=312094794461&hvpos=1o4&hvnetw=g&hvrand=3891345746911194882&hvpone=&hvptwo=&hvqmt=&hvdev=c&hvdvcmdl=&hvlocint=&hvlocphy=1027744&hvtargid=pla-535849621413&psc=1&tag=&ref=&adgrpid=62497261819&hvpone=&hvptwo=&hvadid=312094794461&hvpos=1o4&hvnetw=g&hvrand=3891345746911194882&hvqmt=&hvdev=c&hvdvcmdl=&hvlocint=&hvlocphy=1027744&hvtargid=pla-535849621413Regarding the generator. PI EMS require a bonded neutral and ground, Honda eu generators do not have that. You take a male cord cap and put a jumper between Neutral(silver) and Ground(green), plug that into one side of the duplex outlet and the trailer into the other. The EMS will be happy and turn on the power.
Did I say that a lost neutral will burn up most or all your AC devices! Yep, but I will say it a second time!!!! A friend had this happen to his America Eagle MH and the repair was 12K+! TV's frig, MW, converter, inverter on and on.
BTW
Using a 50amp to 30amp dog bone does not expose you to the lost neutral issue when you plug into a 30amp circuit on the power pole.
Chris