The optimum foam for seat cushions is too hard for the optimum matress, so for the Unimog camper, we put a one-inch bunk-sized memory foam topper from Camping World on top of the bench cushion and it made it work very well.
Originally Posted by Scoutman
On the other hand, the rear mattress in the Sprinter started out as 2 inches of memory foam bonded to 2 inches of firm bed foam. While it was good enough, it wasn't asclever as it sounded; the memory foam had too much give. We recently swapped it out for a 4" foam mattress which we bought at Ikea. We ditched the cover, cut the foam to the necessary shape with an electric knife and put the trimmed mattress into the prior upholstery cover. That's working out extremely well.
2007/2012 custom Jeep Rubicon EartthRoamer motorhome
2004 Jeep Grand Cherokee Limited
2003 Mercedes 2500 mid/tall Sprinter camper
2006 Honda PS250 Big Ruckus Expedition Scooter
1996/2002 Honda XR600R highly-modded