I installed a very similar 12v outlet on our Jayco Class C. The only difference being, the one I purchased had a 12v meter in it. I pulled power from the LED lights over the sofa, which we rarely used. The lights were protected by a 10 amp fuse. The 12v outlet pulled less than 5 amps and we had no problems. We used ours a lot to charge phones and tablets.
You won't be able to run an inverter larger than maybe 150 watts. If you want to run an inverter, run it directly to the battery. Get a larger one than you think you will need as you will probably want a bigger one eventually.
-Michael
