I use a home-made box that I’ve had ever since I towed with a full sized van. Not pretty but very handy. I use a folding cover and it sits below the top. When the top is opened and folded against the cab it covers the box.
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2011 GMC 4X4 dually CC, 6.6 Duramax with Allison Transmission. Formally 2001 Montana,2007 3400RL Montana, presently 2018 3401RS Alpine.
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