Been giving this a bit of thought Jeff, and really if your thinking you just want a transporter that may see some grass and packed dirt a tammy rig will fit the bill. Not going to be 6X6 but will work. Grab a Globeliner and the only must in my opinion is a reduction off the gearbox since the stock gearbox ratio's are just too high. Throw the reduction unit in and some off road tires for the back 2 axles and you'd be good to go. Just another thought.
http://www.ebay.com/itm/Add-On-Speed...0AAOSwknJXyjiI
http://www.ebay.com/itm/Rubber-Climb...wAAOSw3YJZSkKd