-- Disconnect the shore power
-- Disconnect the city water supply
-- Disconnect the sewer line
......I'm sure you would agree these are extremely crucial steps to assure a safe departure. Slightly less crucial, but still quite important are.....
-- Stowing the roof top satellite dish
-- Securing the TV in the salon that is mounted on an articulated hinge
-- Putting away everything that could, in the event of a sudden stop, become dangerous airborne projectiles
-- Closing and locking all exterior basement storage bins
-- Stow the window awnings
-- Look under the coach and trailer to be sure there is nothing there that will get run over when you begin to move
-- Make sure all the cupboards and drawers are secured
-- Turn off all electrical appliances
So, as you can see there is a lot for me to think about. One thing I do is keep a 'white board' on the steering wheel to remind of things that must be done before I turn the ignition key to the right. My rule is this board is not removed until I have gone through each step and confirmed the task is done with TLE, and it works.