And nobody can figure out what he meant? Not all of us are electricians. Clearly he meant he only had a household type outlet to plug into.
To the OP, I plug in to a regular household plug at my house all the time. I normally switch the frig to run on the 12 volt side if I'm using anything else. I can get one of my A/C units to run, but haven't tried both as I just assume that won't work. I'm going to guess you have a auto-switch so if you plug the RV in to any outlet with power, your 110volt system is going to switch to all be powered from there and your inverter gets disconnected. So you can't use both, at least that is how my motorhome is set up and I'm pretty sure most are that way.