Folding Braket", Praket, brace folds up & down to 45-degrees to 90-degrees Heavy duty. I came across them in a search at
Home Depot, but you have to
order them from the service desk. 12"-inch and 18"-inch comes 2-two to a pack. Just find a wall add a board and you have a shelve. They are heavy-duty. I'll take a photo and add it to this post tomorrow. Has 1/4-holes for mounting board with screws.Made of Metal.
Note sizes
https://www.homedepot.com/s/folding%2520braket?NCNI-5
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2021 Mercedes-Benz 3500XD, Galleria, Li3
2005 Winnebago Tour, Cummins ISL 8.9L 450HP turbocharged
2003 Forest River, Reflections, Freightliner Chassis