A few points.
1. Watch the weight! it is far too easy to end up with a very heavy tray, which may be unbreakable, but that is all you can say for it. Properly designed, a steel tray can be just as light as an aluminium one, but steel rusts!
2. If planning to galvanise it, this needs to be considered at all stages of design and construction - no pockets to trap metal, no closed spaces, no flat to flat joins (these are rust traps anyway!), planned lifting points, all holes drilled before galvanising etc.
3. I would not use wooden decking - sure, it is easier on the feet, things don't slide etc, but in Australia's climate, with humidity varying so much and for long periods (I have seen it here between 2% and 99%) wood contracts and expands, comes loose, warps, rots, encourages rust of fastenings and frames, is damaged by stones more than metal, and will usually be heavier than a metal deck of the same strength.
4. Have a look at (and photograph details of) every ute and truck tray you can find.
5. Build in as many lockers as you can, but make sure they are, as far as possible, water and dust proof, have hatches that are secure, lockable and won't catch on anything.
6. Use wedge locks on the sides and tailgate - they stop rattles. Fitting removable pillars in the rear corners can make it so you can lower either side or back without opening the other.
Just my ideas
John
John
JDNSW
1986 110 County 3.9 diesel
1970 2a 109 2.25 petrol
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