REPLACE the seat!
I've been feeling older than my 49 years lately. I feel pretty good after work but the long commute home takes its toll. I thought the seat was partly to blame. The truck is a 2007 Ram 1500 with 240,000 miles. The drivers seat had a few rips and didn't feel as good as the passenger seat, so last week I bought another seat from a 68,000 mile truck of the same model year.
Holy Crap! I had no idea how bad the old seat had degraded. Suddenly the truck seemed to ride better because the seat isn't springy and bouncy. The truck seemed to handle better because the seat kept me in place. It smells like a 2 year old truck. No rips, no stains. I should have done this a year ago.