Do a search on NODWELL or FOREMOST. You will see what they look like new and as built. Ours has had the box on the back built and the seats aded to the top for use when we park it out in a big meadow. We climb on top and use it as a portable hunting stand. It's 15 feet from the ground to the top of the box. This rig had been used by the army for years, Mike bought it from salvage. We then rebuilt it using what we had availiable locally. It has a Catapiller 3208 diesel engine. Top speed is about 7 miles an hour. We have mud areas that you can't walk across, mud about 4 foot deep with the consistancy of choclate pudding. 4-wheelers can not get across, anything with tires can't cross it. Yet a Nodwell will crawl across it, sinking about 2 inches. Any vegitation it crosses and mashes to the ground is pushed down so gently that it pops back up almost immediately. If we leave the trail and go out across country, 24 hours later you will not be able to find our trails.
Here is a picture of my little rig, It's a Raidtrak 1800.