Would this help prevent the salt damage to your cargo area?
1999 Toyota 4Runner Cargo Mat & Trunk Liner - Custom Fit For Cars, SUVs, Minivans | WeatherTech
If this works its a fairly inexpensive way to keep from having floor panels rot. That is if it will work for your application of the surf boards. Maybe its not a solution. Just a thought. :-)
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7 3rd gens listed in the build thread (2 are parts mobiles)
Build Thread:
https://www.toyota-4runner.org/3rd-g...os-builds.html
Brillo's Bucket Fluid Ex changer:
https://www.toyota-4runner.org/3rd-g...ml#post3358086
Sparks Plugs Wire and Coil Information:
https://www.toyota-4runner.org/3rd-g...on-5vz-fe.html