If I can chime in here, the weight capacity will be determined by your tires and springs and the axle bearings, the tires can be upgraded to handle way more than the van should haul, same with helper springs and add on airbags etc. the down fall is in axle bearing wear, and axle housing strength. unless you intend to haul a ridiculous amount of weight you will probably be fine with a 8 or 10 ply tire and a booster (helper) spring to level it out. just keep an eye out for axle seal leakage it is the first sign of eminent bearing failure. <br /><br />on a side not about the size of engine between types of vans, just because you have a smaller engine doesn't mean it will get better fuel economy, a small engine working harder to do a job will burn more gas than a bigger engine that don't have to struggle to to the same job.<br />food for thought.