I have 2 - 1.5-2" thick Thermarest self inflating/deflating pads that
I use on the bottom mattress as my "trunk weight" causes pressure
point pain to moi when I sleep on my sides.  They work well, roll up
as they are made for backpacking or fold in half & store behind the
upper folded bed when the poptop is down. You  use 1 for each
sleeper, so you don't necessarily need 2 unless your trunk weight is
more than Al Knoll's or Mr. Squirrel's, I am not sure which 1 is
which?  The pads are flat on both sides, easy to get dog hair off.
(ask moi how I know)

I think they are about $60-70 apiece. but are lightweight, portable &
easy to set up/store.

YMMV,

Mr. BZ

On Aug 15, 2008, at 9:37 AM, J Stewart wrote:

> This year at Everybus I couldn't take it after one night sleeping
> up top. My daughter, who will most likely not be camping with me
> again, insists on getting the bottom bed. That top mattress is just
> too thin! I had a friend drive me to Wal Mart (uggh, but it was the
> nearest store) and I bought a 1.5 inch  memory foam mattress topper
> for about $55.00. It's smooth on both sides, and has a zip off
> cover so it can be thrown in the wash. It fits the top bunk
> perfectly, but I'm sorry to say its too thick to be folded up and
> stored up there.     jeff