I used 3/4" stainless sheet metal but do not remember the size...maybe 8 or 10? Not self tapping. I first used the smallest drill bit in my set to make sure I had backing plate behind all 4 mount holes. Then predrilled the final wall screw locations (3/16" bit I believe) to mount the bracket. Same small TV as yours. Used a mount that easily detaches tv from wall for TV storage while traveling. Sorry I didn't have specific specs but you get the idea. The wall backplate is very thin but it does the job.
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2021 Flagstaff 26FKBS (manuf. 3/20/2020)
2019 Ford F150 XLT-3.5EB, Ext Cab, 3.55, Max Tow, 1,910# Payload, Blue Ox 1500
2018-12 days/2019-83 days/2020-12
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