Originally Posted by boondocking
I connect the generator to the trailer (no breakers are off) then fire up the generator. Have been doing it this way for years, with no harm to trailer or generator.
I've done the same but every once in a while, mostly during cold weather, the generator can stumble if the batteries are down and water heater electric element is turned on.
one should just turn the main breaker off at the distribution center and let the generator warm up a few minutes then turn it on. Even if just the amount of time it takes to stroll in to the power distribution panel and turn the breaker on. Good time to check to make sure that unwanted loads like the water heater are turned off too.
Even large generators that provide emergency power have delays before they take on load. Lets engine become fully lubed and able to handle load without struggling and producing low voltage.
I too have done it the same way as you and have not had problems but not having problems so far doesn't mean there can't be some in the future.