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Mold is much less costly on your wiring/electrical/computer systems.
Just getting salt laden beach sand inside is not so good if/when you add moisture from air
... I work on cars, I know what salt water does to the insides, and how costly it can be
'tis true....but for others, mold can also be costly. One of the owners of a dive shop near Hamilton was hospitalized with respiratory problems.....eventually had to get rid of his truck because the mold in the back of the crewcab (from tossing wet dive gear inside) was killing him.
"The floor has been covered with EPDM rubber roofing material"
great idea, low cost, trimable to fit, and I bet you could cut it long/wide enough so it curves up the sides of your trunk making it a waterproof "bucket" (you would have to make sure things like jacks, spare tire hold downs are padded underneath it so you don't puncture it)
'nuther question: do you all keep your weights in whatever container you use to haul your gear?
That's probably the problem with my thinking. Sometimes we do a walk-in dive, and sometimes we are on the boat. I was trying to think of a way to keep my gear storage the same regardless of where I go. Maybe I'm just making this too hard?