Somewhere along the line, you have to grow a brain. Seriously overloading tires and your van in general won't make you a bunch of money in the long haul--- in my case, no extra money at all since I'm paid by the mile-- but it will sure play havoc with your equipment. It takes more out of your vehicle to carry that weight, to get it started, to stop it and so on. Springs, shocks, brakes, tires, engines and trannies all pay a dear price for you thinking you can load your van to the point where the axle is resting on the rubber blocks. Buy enough van for the weight you expect to carry, then be very, very cautious about ever overloading it. You won't make enough extra money to pay for stuff that breaks-- trust me on this.