You have heated seats? Try turning them on to warm your back up to get some circulation. Play with the position. You would be surprised at how much of a improvement a very slight adjustment can make. As a last effort, you can have a good automotive upholstery shop customize your seat. Your seat can be as comfortable as your favorite lounger. They can add more or less support, different contours and types of foam firmness. They even use memory foam if you want. Shops do that kind of work all the time. It will cost a couple of hundred bucks but your back will thank you. It will be well worth it if you are uncomfortable with the factory seat set up.Love my JL as a DD. However, on a long trip, 4 hours is about all my back can take without a break, I wish the seats were just a tad better. Then again, at 64 years of age, my back does best in a recliner!