3/8" Wall Thickness

Is 3/8" to thin for the middle section on a sandwich built wall. I've got the line up
on 10 sheets of 4x8x3/8" plywood for $5 hear at work (that's total)
Trailer will only be 42"x7' ulta light if that helps with the answer.
Thank You

Trailer will only be 42"x7' ulta light if that helps with the answer.
Thank You