Thank you, I understand that Kelderman isn't a true air bag suspension but I do like the lighter leaf springs. Mine are rated at 7,000 but the weight without passengers is just 5,900. I have already spent a bundle on upgraded sway bars and steering a stabilizer and they have helped some, but my coach is still miserable to drive on California's concrete slabs. I just don't want to invest the money on the Kelderman system and end up with only marginal results. Here is a short video that looks like the air bag may absorb much of the harshness caused by concrete slabs.