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The CUCV's had gigantic trays, different than the stock civvies. I seem to recall fitting a pair of group 78's onto one with a bit of work, and they should be a direct bolt up to an 81-up truck.
If your adapting one to something else,look at a local body shop supply store that sells rust repair and crash repair parts--they have many different battery trays available in their listings to replace OEM ones that were rotted or damaged in a crash for cheap money..back when I had my 81 van on the road,I wasted a day welding up the rotted battery tray,and a few days after ,a friend showed me a "crash parts catalog" a guy came in with from a crash parts distributor--I could have bought one new for 15 bucks....