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The longer sleepers are generally made 90" wide, with options as wide as 100" or so. Seems likely that would be too wide for most overlanding uses. There's also a gaping hole in the front end to walk through to the cab. Perhaps a company like Indiana Custom Trucks or Double Eagle might build a unit to spec, but their normal units likely wouldn't work.Who builds the sleeper boxes on the semi trucks? I've seen some very large ones that would be perfect for a camper.