Galley ledge

Galley ledge how thick is it and what is it made out of.
I wolk up early this morning and thought what if it warps over time? mine will have 4 supports in all, 2 supports both sides, and 2 center ones the with of a cooler form each side. about 15"
I may store things on it when traveling or between trips.
do you use a metal frame or just a thick pc of ply?
I can not put in a poll with check yours because it is a question I never asked for all the hundreds of galleys I have seen.
Ron
I wolk up early this morning and thought what if it warps over time? mine will have 4 supports in all, 2 supports both sides, and 2 center ones the with of a cooler form each side. about 15"
I may store things on it when traveling or between trips.
do you use a metal frame or just a thick pc of ply?
I can not put in a poll with check yours because it is a question I never asked for all the hundreds of galleys I have seen.
Ron