I want to put my '79 e150 super van rv onto an e350 chassis with the donor vehicle being a diesel. Has anyone done this? I am sure it is doable. I may not be able to find an e350 super van to be the donor but I do not think it is a big deal to extend the frame for this. Any and all advice or comments would be greatly appreciated. This rv is part of the family and I cannot bear to pay $140 per fill up. Thanks.