ppine wrote:
Concrete highways are normally 4 inches thick to stand up to truck traffic. Call some contractors and ask them. You might be riI ght on the margin of safety.
I had a 90 Ft driveway and parking pad poured about 6 years ago. I specified 6000# mix with rebar on 24in center 6 Inches thick. Worked well for our prior coach that was 32K lbs and has performed well for over 2 years with our present coach for over 2 years which weighs 42K lbs with no cracks. I do use 1-1/8 plywood under the tires and smaller wood under the jacks, but so far it has performer well