DO YOU NEED A REFREGIRATED TRUCK TO DELIVER SEAFOOD IN SAN DIEGO?

I'm pretty sure you do, it gets hot here pretty quickly sometimes...why don't you try calling local seafood distributors and ask them how do they transport their seafood in a fridge truck or just tons of ice google seafood distributors in san diego and a list should come up call and ask or the health department of your local region should be able to help you

Without a doubt, you will need a refrigerated unit to keep the product frozen the entire journey.

depends. if you're delivering to a chum factory, no, you're fine. if you want to deliver it safely for humans to consume, of course.