Well I am 6'4" and it works great for me. It really is best for solo stuff. I just sleep in the back with my bikes. I suppose a weekend with just my wife and I would be fine, but that would mean no bikes and no kids.For those of us above 6" and with a wife near 6" sleeping in the truck bed just wouldn't work.
Wife was always jealous of @Adventurous 's old setup until I pointed out our heights versus a 6" truck bed.