Hi,
Assuming I turn on the air conditioner and it is hot as Hades the demand may be as much as 1900 watts. At the RV park that was enough to take a 30 amp service down to 105 volts which is NOT in my comfort zone. I am assuming that adding the autoformer may give me an 8% boost which should put me in the ball park of 113 volts.
Assuming I'm WRONG (oh so often I am) then at 110 volts that 1900 watts should do about 19 amps. Hopefully that will not trip the campground breaker.
At the person's home where they have the 50 amp supply there should be no worries about tripping out the shore power.
I may leave the Magnum in load support mode to help with any surge issues.