It may be deemed expensive, but here is what I added to our rig to ease the storage access:
Use Rubbermaid storage crates on the sliding tray. It may not help with the storage configuration, but it makes getting at everything in the basement a lot easier!!
Bingo
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Bingo and Cathy - Our adventures begin in the hills of WV. We are
blessed by our 2014 3850FL Big Sky (previous 2011 3750FL and 2007 3400RL) that we pull with a 2007 Chevy Silverado Classic DRW CC dually.