Macon,
Try a camping pad called a thermo rest.  I place two under my main pad
for sleeping.  We also use them to sit on around camp and for
backpacking.  They deflate and take up very little room.  There are some
off brands that are cheaper, but I have had no experience with them.
Mine are over 8 years old and have never had a problem.
They come in several lengths and widths.

Good luck
Call if you have questions 1-800-264-6757

Kenneth Winter
East TN
95 Isuzu Trooper
87 Toyfalia