wbwood wrote:
But from what we understand, Mercedes does not allow their frames to be stretched or altered. As others mentioned, you do have the new Ford transit in the lineup now as well as the Dodge Promaster.
Don't rule out the possibility that I have my facts wrong, but you are correct about the Mercedes frame. The wheel base is not allowed to be altered. I recall reading somewhere that a little can be added behind the rear axle as long as it is bolted utilizing specific holes, not welded on. It has something to do with the welder's heat weakening the strength of the steel. Given the Sprinter has a box frame with flanges, welding would also be extremely difficult to assure proper strength & longevity.
I also think drilling a hole in the frame is not allowed. The Sprinter frame is made with a thinner, higher strength steel to cut down on chassis weight. I wonder if by it's very nature, that type of steel is more resistant to barnacle rusting.
I believe the same rules apply to the Transit for the same reasons. I can't imagine adding anymore to the Promaster given it has only a Single Rear Wheel (SRW) axle.
For the record, the E-Series frames are are big & thick. The E450 steel is thicker than the E350. I don't believe the type of steel used is as strong as the Sprinter and Transit but the extra thickness, the shape and dimensions compensate for it, therefore offering heavier load limits. The type of steel and the "C" shape of the frame, accommodates for welding and drilling which allows outfitters to stretch the frame.
