NJC, there are 3 unimogs that i know of that are currently used for recovery on stage rally's. Mine, the orange one and a yellow one. All 3 are substantially different. The orange one is the original and in my opinion the best. The owner has had it for 12 years of refinement.
Craig, my mog came with a 5 ton hiab behind the cab, the hydaulic winch mounted high up between the lockers at the back and a hydraulic under lift for lorries / buses on the back though i doubt that ever had the power to work properly. I purchased the back off a 7.5 ton Iveco and re-engineered the bed and spec lift that is now on it to fit. New different length rams, pipework, valve blocks, winch mount at the pivot point, multi direction roller fairlead on the spec head, changed the angle of the main dropping beam, lengthened the main dropping beam, mounted the spec chassis on the old hiab mountings behind the cab, fabricated / mounted the back of the spec lift body to the rear cross member, rewired and refitted the rear lockers. On closer inspection those in the know would realise that this is only version 1 of the spec lift mounting as with the hiab mounting plates (15mm thick, over 700mm long along the chassis and in the region of 500mm high) and the fact that i have bolted the spec to the rear chassis cross member this has removed the flex out of the rear chassis. In time i may change this to allow for flex but in the use that i intend to give it this is really not a high priority at the moment. It took mos weekends between the end of August and the start of the WRC to get as far as we did.
As for how the weekend end well it did all i asked of it until i picked up to tow the caravan home. I managed 30 miles from the camp site with 70 more to go and pulled into a garage for fuel. It was dark and until that point i had been moving and had not noticed an issue. However upon stopping smoke was billowing from the front offside hub. On inspection it was boiling the oil out of the hub as i think the bearings have collapsed. I moved it to a gateway and called a commercial recovery operator that i know. The net result was sleeping in the caravan and being collected the following morning. It was cheaper than a sunday night call out. As yet i have not had time to get the wheel off and start stripping the front hub to assess the damage. That will now be my winter project.