So here are two ideas I've had this morning while bumping along the freeway on our nasty, nasty, poorly maintained concrete freeways: 1 - Have the driver's seat re-constructed by a high end upholstery shop. I have the next-gen leather seat - I'm thinking perhaps putting memory foam in the bottom cushion. 2 - Have a race shop build a custom suspension set-up geared more toward comfort and less toward sport. This would be a set of springs with lower rates, plus digressively valved shocks, such as Bilstein's PSS9 series. Digressive valving means a shock is softer over small bumps (such as expansion joints) while retaining damping over big hits.