The last Dodge 1500 van rolled off the factory floor at Pilette road in 2003. Little market interest in converting them now.
The latest Dodge 4x4 conversion I've ever seen was a 97. They moved the gas tank midship in 98 and that took up the traditional left drop transfer case area. Plastic gas tanks are hard to shorten like the Ford midship steel tanks were for 4x4 conversions.