We have a 1" memory foam topper on ours, and it made a huge difference. Our rear shell just barely closes now with it on (with sheets and a very thin blanket), so I'd say that's the upper limit of what can fit there unless you want to take it off every time you tear down.
Dave
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2000 2720SL & 2007 3124KB
2005 Toyota Sequoia
Twin Battle Born 12v 100Ah LiFePO4 (BBGC2) batteries, 300W solar on rear shell, Link 10, Lift kit, Maxxis 8008 225 75/R15 E tires
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