Calculate the pressure from a Model 300CII Mobile Boat Hoist applied to the concrete.  

Rated Lifting Capacity 					660,000 lbs
Shipping Weight of 300CII				259,000 lbs
Vehicle Gross Weight 					919,000 lbs

The vehicle has 8 tires 24.00:49; Therefore each tire supports = 	114,875 lbs

Each tire has a contact surface area of 526 sq inches		    218.4 psi
Each tire has a contact surface area of 3.653 sq ft		31,447 psf