my electric cord is hardwired, as is my surge device, so they come with us.
As others have mentioned, I would be very reluctant to leave those behind even if i had a choice.
When I do have the water hose hooked up, to date I have always just disconnected it from the spigot and stowed it since that really is no big deal....but I wouldn't be too concerned about leaving it either....
We routinely leave any camp chairs, under awning rugs, door mat, etc.... pretty much just as they are.... in fact I usually take pride in parking back again right in front of the door mat.
i will usually put the cable through the bikes and sometimes lock the bunch to a picnic table or such..... but not always.