I'm converting my conversion van because the fold-down sofa bed just isn't big enough. What are most of you using, for instance, when you build your bed along one wall of the van? Standard single mattress? Custom cut foam cushion? I've priced custom cut foam from several internet sources and it's still pretty pricey. Got to be an easy, economical way of doing this. I'm 5'9", 155 lbs, can't have my head and feet hanging off the bed, ya know.<br>Jesse<br>