A couple months ago I was helping my wife's friend move about 100 miles. I'd told her ahead of time to rent a 6x10foot trailer, but she went and got the 4x6foot instead, swearing up and down all her stuff would fit in it. Well, it obviously didn't. We ended up cramming that sucker completely full, filling her car and her boyfriends car to the brim as well as filling my back seat and bed. But we still had the mattress and boxspring to deal with. So what we ended up doing was shuffling some things around, moving some stuff from the bed to my passenger seat, and we were able to get the tonneau cover on my truck rolled closed, then put the mattress and box spring on top of my tonneau cover (queen sized incase anyone cares), but that covered the stake pockets so I couldn't strap it there. Instead I ended up attaching a ratchet strap to my backseat bracket and running it out the back sliding window, and securing it to my hitch. I had also laid a piece of 3/4 plywood on top of the mattress, to sort of sandwich it down when I tightened the strap, to keep the sides from flopping around. It wasn't the ideal way to do it, but it worked just fine.
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