Hey Kirby 42, when we took delivery of our new 378TS, the cabinet space you are referring to had a prominent sticker on it that said "Do not use for storage". So if you follow the manufacturer's advice, your question is a moot issue. I figure they put that there because they did not want extra weight in the cabinet because it is in a slide out.
But for the real world, all of the prior suggestions above will work. Plastic baskets and light items.
Happy Trails, fbconsults
(Forrest and Donna)