Man the trays are one of the best options on the max, we bought two soft coolers that fit in them to help keep the floor clear.
Thats not a bad idea at all. Currently put one of those soft shelled yeti-like bags behind the drivers seat to serve as a cooler. Could put a much larger one in the compartment. Currently have 10 rolled towels in the starboard one and 10 life vests in the port side.
2018 Max - Ultrablue flake/Gray - 4400 lbs water (720s midship), 750 lbs lead somewhere