if your thinking that a hard rubber pad is going to save a driveway when you run over it with a 315, you need to re-think your thoughts. Fact of the matter is that alot of driveways are built to withstand occasional use by personal vehicles under 5 ton. With rubber pads, you might not scratch the surface, but sit and dig on it and you will have it all cracked up. Your better off to just leave the tripple steel grousers on it and put old tires or conveyor strips down when you wanna cross a driveway.
You have to remember, your 38,000 pounds not 3800.