I was parked in a friends driveway for a few days where the best I could get was a 15 amp outlet in the garage with a 50 foot cord. Plugging the motorhome into the small cord and setting the Xantrex control panel to 10 amps would have worked until one of us tried to turn something on. Genset use would have been too rude in that neighborhood.
Instead I hooked up an automatic Sears battery charger to the house batteries and "dry camped". Everything worked except air-conditioning and HydroHot electric heat. The battery gauge on the Xantrex control panel would drop during evening hours with the lights on, TV on and HydroHot running. By morning the gauge would read almost full. My charger label says it draws up to about 8 amps so my friends cord and outlet were not challenged.
It seemed to me that where you are severely limited in amps, or are in a place where the campground power is not trusted, that putting a relatively cheap charger between your motorhome and the power grid might be the best way to plug in. I asked a few people (including one Monaco engineer) and posted the question on line. The answer was always "It does not seem to be a good idea, but I can't tell you why."
Yet it seems to me that the motorhome electrical system would see the batteries with a charger on them at about 13 volts the same as with the alternator providing about 13 volts.