I noticed a similar problem with my bed when I bought the coach. Additionally, I needed a new mattress, and thought I could fudge the width another inch or so in my favor, so needed a new platform anyway. I simply cut a new platform with 3/8" material rather than the light 1/4". The results were quite satisfactory.
I am ashamed to admit I never thought of additional supports. Either approach will work, but it would take some math to compute which saves more weight.
Mark
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