Better to call bed manufacturing like Jerrdan or Miller to find out. 

The axle ratio of a vehicle, such as a 3.31 ratio, refers to the relationship between the number of times the driveshaft turns and the number of times the wheels turn. In general, a lower axle ratio, such as 3.31, is better for towing because it provides more torque and power to the wheels, which makes it easier to pull a heavy load.

I would have to agree with the answer above!