I hope you are getting at least $1.25/mi for those 3-4000 lbs loads. Too much wear and tear on that vehicle for anything less. JMHO.As a Promaster owner, I've found that the 3 skid capacity my company requires isn't nearly as significant as the increased weight capacity. I get loads over 3000 lbs, and occasionally right at 4,000 lbs. I would likely not change anything if I were an independent.