We still have original 15 amp unit it works so why fix it.
The 30amp adapter gordon2 mentioned is in our camping kit as we have needed it.
The cord we use is 100' and rated for 20 amp 12 gauge, 2433 watts but trailer draw is 15 amps as usual. We have second backup cord that is only 15amp 1825 watts and a 30amp 10 gauge cord as well but it is not that long; extra watts could be useful.
30amp 3650 watts is over our needs.
We go through a quality home surge protractor that has a 15amp breaker.
A Lee Valley water tight exterior power station box the holds the surge unit and into trailer cord. (sits under trailer rear)
The trailer has a 120v 15amp breaker first and then goes into the converter for 12v and
battery charging system.
We have considered having a Y connection for an extra AC plug, using outdoor cord too other side of trailer. This would have meant possibly a heavier cord and/or second surge unit in box.
Currently will setup a new wall unit to go direct in with cord at wall instead of pulling out the cord through wall then through the surge unit to the 15amp breaker and then converter unit inside trailer instead of using box outside. Just seems better.
Cord is 20 amp 12 gauge so could make a small change inside. Would allow us to use a toaster and a few
lights lol counter. Kitchen 110 plug is through main system and only works shore power.
Idea:
Connect a 20 amp main breaker inside first
Connect two 15 amp breakers next to main 20 amp breaker
Connect two surge protectors to the 15 amp breakerss
Run first surge unit to its own 110v plug outlet
Run second surge unit to the main system.
20 amp breaker would protect cord draw limit and 15amp units would protect main system and outlet from drawing over inside 15amp limits.