D45: It's that last 2" of width that is the killer...
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That's not a cargo box, but a roof top tent. It folds out to an elevated California king sized bed plus and annex room below for 2 more to sleep. At the top it's about 8'-2". Our bear-safe rolling hotel room.
That does look good but "bear safe"? Not so much.
.Stingray: I know you have a rooftop tent. Always wanted one but my main focus is how tall does the bed/cargo box become once you put the camper top on it? Floor to ceiling?
Ford says its 21.4" floor to the top edge of the bed. Looking to try and understand the cargo space with a camper top on the truck vs the stated 54 cu Sq/Ft on Fords website. 54 isn't much more than a 4Runner on its own.
Ultimate goal is talking the other half into a full size truck as we travel a lot and these F150's just have soo much interior space in the back seat with the 4 doors (mostly will be used by the dog) and then the bed compared to our X5. I think a camper top will put it over the edge as a contender due to how much space it gives us to carry us and all our junk around.
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Ah, sorry, I didn't understand your question...
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The bed sides are about 22" high, and the ceiling with the SnugTop on there is 43" from the bottom of the bed. There are truck caps that are bumped up for another 6" or so, as an option. When we travel, the bed holds our fridge, kitchen, supplies, water, shower, camp chairs, tools/recovery stuff, etc. The back seat of the cab is what we use for our "trunk" (boot for you east of the pond). Here's a couple of pics (the area is ENORMOUS):
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The box on the floor is the Sony subwoofer in the upgrade models.