I have 2, 1100 auto's in rear with a 700 that was there when i bought the boat, i also have a auto 500 up front that was there when i bought the boat.
The 700 and 500 are switched on and off at the dash so when i want them on i can. The 1100's are auto, one higher then the other, both connected direct to a different battery. This way when at mooring one can come on till battery dies then the water can come up a little higher and turn on the 2nd pump till that battery dies. Hopefully that would buy time till let say day light when itcan be seen and helped!

i also have a light wired into the auto bilge system so when the pump kicks on, a light on the dash comes on. found a split livewell hose one day when everytime i took off, i noticed that light would come on for a second or two.

Smart - sounds like you have it covered.

Mine gets moored next to the house with a " day tarp" covering it to keep the sun off and the rain out. Babied, that's how my V21 sits when not in use, on the trailer. At least one good thing about trailering.