I have the same problem with my Ford 450 and MS 38RL 5er. I can feel every bump in the road. Everyone I talked to said the bolt on airbags would control level but not comfort, even got worse. I went for another solution which was to put air between my backside and my seat (like a semi air seat). I went to the www.therohostore.com AIRHAWK® Truck Seat Cushion System AHTRUCKPL for $89 with 60 day money back guarantee. I really like it as it absorbs the road bumps very well and fits the standard truck seat just right. The individual air cels allow ventilation so you do not sweat. It comes with a nonskid cover, repair kit and a manual pump. I keep the pumps in the door pockets and can easily make adjustments on the road. I will not be sending mine back for the money back guarantee.