If you have AC and want a dock filling station, think about getting a small irrigation (sprinkler) pump that runs on AC. They are available at the blue and orange big box stores as well as places like Granger / tractor supply for under $200. The 1HP ones would be a LOT faster than the Tsunami and you could mount it with switch and plumbing hardware to have a more permanent set up where you do not have to hook everything up each time. That set up could also double to wash your boat / dock as well.
You could get a female cig outlet at any auto parts store and wire it to any DC converter including a battery charger.