One thing to bring up as far as comfort is concerned. If you are sleeping on a platform in the back treat your rig like a camper. Try to keep it level. Even with rocks. If you park and sleep on any grade you and anyone else in it will sink to the low side. Not comfy. Trust me. heh
Great point. It's ALWAYS worth the effort to get things level. If I have to compromise, I prefer head up just a tad but definitely not head down.
Which leads me to make sure to account for weight when in the sleeping position potentially effecting suspension sag. That may just be me as I sometimes sleep 4 - two in car, two in RTT. That extra weight nearer the tail may make the rear suspension sag a bit more from level.