Before unplugging power, flip the breakers off !
I'd add to not only drain the black / grey tanks , but do a couple back flushes as well if possible.
Cable (TV)connection cable.
Check power pole hookup ,faucet, sewer etc didn't leave anything left connected at the pole.
I've went to hook-up before and found 30 to 50 plug plugged into the power , water pressure connectors on faucets, sewer threaded piece still screwed into the sewer drain..
Like others have said pull out do a walk around again , then have the Mrs (or) do a headlights high and low,turnsignals brake, backup lights check. Pulling a toad same for the rear lights on it too.
Don't worry bring along a tablet and right down what you forgot to bring , every trip out we've done we come back home with at least 5-10 things we forgot to bring.