It is difficult to determine at this point what type or make of units is best suited for your needs, a bit more information I believe is essential, like:
What type(s) of forklift(s) have you planned to use in this facility you are building?
Will the unit or units be travelling between the processing operations (sloshing thru the wet & briney water) to & in /out of the freezer?
What type of clear working aisles are planned for in both areas? What is the expected working hours per day per week per month per year? How many lift are you planning for?.
What is the max. load weight handled & l w h. & max top shelf height, over head clearance obstructions (freezer door, dock area, racking tunnels, etc
Average distance traveled one way, anticipated number of loads handled per day or hour or week. Ave. time spent in side the freezer
What other functions will the lifts be required to do - like shipping, receiving, etc.
No doubt this list is not complete but it would give your audience a bettr pic of type of truck that might be best suited.
In my opinion, the briney operation coupled with the in/out of the freezer will cause more (electrical & electronic based) issues than either one alone.