Put your deep cell battery on a 2 wheel dolly. Better yet, mount everything on a dolly you can just move from one local to another. How about one of those 12 volt battery boosters for jump starting a car? They have a handle for carrying and clips already for your bilge pump wires.

Dear Alcohol, We had a deal where you would make me funnier, smarter, and a better dancer... I saw the video... We need to talk.