Originally Posted by brat1598
So its not sopposed to have both?
It's not that it's it "not" supposed to have both. But it wasn't from the factory with both and it was something that the previous owner added on- either by their own or they had their dealer do it.
Usually with these 120 volt add-ons, they are dedicated to a specific outlet or set of outlets inside the camper. Some people add them specifically for running high electric use items - like space heaters.
That said, you likely do not NEED to use the 120volt connection. Like I said- I doubt anything WON'T work; there will just be some outlets that won't. Your original question still stands- for a 50amp rig, what limitations are there to only having 30amps available? Of which, my original answer still stands.
You will need a 50amp to 30amp adapter like Herk showed.