Actually it is easier to deal with than you think
on a Motor home with a Generator and ATS you simply put the EMS in the shore line
On a Trailer if the inverter is installed you have either shore power or a portable generator.. Bond the generator and you are good. (usually)
Option two is to modify your install.
Look up a hughes autoformer install. Bypassing a Hughes autoformer is, depending on where it's located, anywhere from a 1 minute job (or less) to a few minutes job.. Basically you pull two plugs and plug one of them in where the other used to go.. That's the entire bypass system.
install plugs and outlets on the in-and out side and your HW is now a PT with Remote.. Very good.
