I have 2 possible places to hang my inverter - one has 1/2" thick plywood and the other has 3/4". The 1/2" panel is attached to the wall of my van so would be more stable. The 3/4" is part of a wheel well box and would need brackets to hold it in place, but I can do that easily.
if you can use bolt and nuts the 1/2" should be good
not so sure about wood screws in a moving van.
Agreed, wood screws into 1/2 in ply not a good idea. Ideally you would spread the load behind the plywood panel, with a wooden batten or at least penny washers. Also use shakeproof washers under the nuts.
If you can't get behind the panel then toggle bolts are another possibility. The wings will spread the load nicely but apply a locking compound to the threads.
