The only real info on the web is Eddi's web site which is in the original post in this thread. I have lots of details photos which I need to get uploaded.
The basic premise is Eddi is a German mechanical engineer and he built everything himself and then he and his wife lived in it for 18 years. Improvemens were made along the way as they learnt how to use it, what worked and what didn't. Of those 18 years it spent 6 years in Africa, 2 in Australia and New Zeland and a couple in South America. The camper is extremely well built and is in excellent condition after so much use.
The truck does need new tires and it does check in at near max gross weight when loaded. The fact it had no serious mechanical problems in 250,000 miles offroad stands as testament to the build quality of a unimog (other than the bearing mentioned above).
I do know some of its mechanical history, after the bearing failure all the bearings and hub gears were all upgraded by the factory to 1300 hub gears. The bearing failure went all the way back to MB who wanted to do a real world test by replacing the 416 bearings with 1300 bearings, the only difference is the 1300 bearings have 13mm rollers where the 416 are 9mm. The outer housing is the same but because of the the different width bearing the outer dimension of the driven gear is a different size which makes a slightly different gear ratio which means all 4 hubs have to be replaced. This was all done free of charge at the factory 15 years ago, if you were to pay for this it would cost $20k+. Its been back to the factory a few times in the last 15 years and they report that bearings and hubs are doing fine. The reason the factory got involved was because of a number of 416s, with disk brakes, having bearing problems when at max weight, the problem does not occur with drum brakes. It turns out that the 3 inch flange that is used on the disk brake axle was putting a lot of load on the hub output bearing and in the drum brake version there is no flange. The SSE Unimog used by the US army has this modifcation from the factory.
I replaced an output seal on my other 416 recently and you can see the giant bearing that I am talking about, unfortunately you can't see the gears.
http://www.robanddenise.com/mogs/hub
Rob