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Chuck, TN doesn't require a CDL on anything that is not commercial. You can drive a 80,000lb 18-wheeler (air brakes and all) with a standard class D license as long as it's not commercial. I understand that other states are different though. The roads around here are packed this time of year...

I am in the "air brakes are better" crowd but there is one slight disadvatage to air brakes that hasn't been brought up. There is a small amount of lag time from the time you step on the pedal until the brakes activate. This is not a big problem but somebody used to hyd brakes will need to be...

IMO, air brakes would be an improvement but not so much that I'd want to do the conversion. The only problem we've ever had with air brakes in off-road applications is mud and dirt getting inside the brake chambers. When stuff gets inside the chambers it will eat the pancakes up in short...