I've got a "big" inverter, but most of the time, it's must doing "small" things. I did just what was suggested a few posts ago. I ran Romex from the inverter (it's in the nose compartment, as close to the batteries as I could get it), and installed a 120v outlet on the TT exterior, right next to the shore power connection. I made-up a 2' lead cord, and I plug the TT into itself! (This gets lots of long stares and curious looks.)
As Herk said, I have to remember to switch the fridge to "Gas Only", or it draws tha batteries down. My inverter has an on-off switch mounted inside the living area, so I only turn it on when I need it. I also keep the breaker on the 120v to 12v converter turned off. All of my 12v charge come from my solar array. I installed a bunch of 12v cigarette lighter style outlets for charging cameras, phones, and anything that will run that way.
My batteries are twin 6v golf cart batteries (Sam's Club), and they are charged with the 300w of solar, but until I break down and buy another pair of batteries, I still need to start the 2400W Yamaha microwave for more than a couple of minutes. Since Margaretta's are usually a late in the afternoon or evening (low sun) thing, I sometimes start the generator to run the Margaritta maker, as well, so that I have 12v throughout the night, and it begins to recharge wen the son comes up. Regardless of how much sun or battery, I can't run the A/C without 30A shore power or the generator.
2014 RAM 2500 Laramie 4x4 Quad Cab w/Cummins Turbo Diesel, 2009 Rockwood 2607, and 3 'yaks!
300W of Suntech Solar, a Rogue MPT-3024 Controller, and a Xantrex PW2000 Inverter