"50 Amp" hookups are really 100 amps. Anything else is a severe restriction to a Beaver and must be managed.
On mine, if the batteries are low, the charger can use a lot of amps for a short period. It does not know when 100 amp hookups are missing. It will surprise you by tripping a breaker when you think your are managing the loads.
Normal "50 Amp" hookups are a pair of 50 amp breakers. Our tipical motorhome is wired with each breaker feeding a full 50 amps into separate circuit "legs". If you do a 30 amp or 15 amp hookup the motorhome is tricked by the adapter to share that source to both legs. So instead of 100 amp potential, you get only a fraction. Most of us have 7500 watt gensets that have a pair of 30 amp breakers. So, even that puts the motorhome on a 40% off electricity diet.
100 amp hook ups: run everything you want, anytime you want it.
Genset only: almost the same, with one exception. If you've been using your house batteries, the charger may want a significant portion of it's 30 amp source. If you turn something else on, like the A/C on that same "leg" the breaker will pop. The solution is to wait for the charger to catch up a little or find the control to restrict it's draw.
30 amp hook ups: You get two run two things. It could be a hair dryer and the hydrohot. Or, one A/C and a toaster. Your chances of uninterrupted power are improved if you turn off the Hydro-Hot electric element, switch the fridge to propane and limit the charger's draw to 10 amps. You might be able to run two A/C units if you manage it right. Once they are running, they use about 13 amps each. So if you can shed everything else, 30 amps can do it. If you get them both running, keep the temp set extra low so that the compressors don't cycle on and off. It is the compressor start up that momentarily requires a high amp load.
15 amp hook ups: You can run only one thing. If you let the fridge run on electric, you get nothing else. You have to switch the fridge to propane and lower the charger draw to 5 or 10 amps. My favorite way to do this is to NOT plug in the motorhome at all. Instead, I put a standard battery charger on the house battery bank and let the inverter power everything. The big draw electric items can't turn on and you can still run a hair dryer or toaster using inverted power from the batteries. The batteries will slowly recover from the charger.
The genset normally has priority over shore power. So, if you do have only 15 or 30 amp hook ups and need to run something like a hair dryer or margarita blender, start the genset. You have to wait a minute or two for it to warm up and it will assume the load. You don't have to unplug the cord. When the hair is dry or the margarita pitcher is full, turn of the generator and the shore connection will take over.
I've comfortably camped in cold weather as a driveway guest with only a long orange cord to a 15 amp outlet in the garage. The key is to make sure you manage the charger draw.
