Using pool cover reel with 16MM weight solar cover?

I am considering upgrading my solar pool cover from 8 mil to 12 or 16 mil. I read in one catalog that because of the weight of either, using one with a pool reel typically negates the warranty on both. I am assuming anyone with one of these heavier covers uses them with a reel. (I can’t imagine lifting and folding off the pool.) Any experience from others using heavier covers with a reel appreciated!