October 9th, 2012.
Rolling 18:
Permit me to apologize for the tone up above, but back in West Virginia, where deuces are often still used as logging trucks, to bend the tie rods on a stump would admit you to a rare and very much harassed majority of deuce drivers known as "Stump Jumpers".
After the first stump, one always considers the way out, or the way over, the next obstacle. Building up ramps on either side of the offending stump or log, from smaller logs, rocks, or dirt gains you ground clearance and protects the soft under carriage items (tie rods, axles, battery boxes and the very vulnerable fuel tank) from contact with the said stump,log or rock. Never damage your truck, it must get you home and it costs money to fix, as no doubt you are finding out now (the Air -O-Matic can be repaired but the parts are not going to be cheap, as a new Air-O-Matic runs about $1800, give or take). Take a co-driver to act as an extra pair of eyes looking for obstructions that might damage your truck, and to help move rocks and logs or dig and pile dirt to get you out of these fixes. AND never go where the Jeeps go, they are much too small for you to follow in tight spaces or sharp turns.
Second, lose the NDCC tires (Non-Directional Cross Counrty) as they give you almost no control on side slopes in mud, loose rock, or snow, a very poor design by any standard and most other armies learned to replace them ASAP. Use MPT (Multi-Purpose-Tread) design tires, which work in mud, snow and rough terrain, however they are very noisy road tires. They will pull you out in a pinch.
U1300L Unimog, 4 ton truck:
Sorry, here's the best I can get you on that one, but they are an aces better off road truck then even our HMMWV's, more ground clearance and locking axles, the older sisters were the S404.114's, still more capable off road then most deuces and can carry 1-1/2 to 2-1/4 tons on or off road
Unimog washed out bridge - YouTube
Mercedes Unimog - YouTube
UNIMOG - YouTube
UNIMOG U 435 - 1300L in der Sahara, Fahrt durch Dünen - YouTube
Unimog S404.114:
Unimog 404 Extreme 4x4 - YouTube
Unimog S404, Belgische Armee - YouTube
The last guy got out in the end in an unconventional maneuver....
M113 APC:
M113 Ride! - YouTube
Enjoy, and perhaps the seamless tubing of the right schedule might work, ortherwise call George or Terry Kivett at White Owl Parts in Kinston, NC. They might have the parts you need.
The pictures down below are of my 1963 S404.114 in Memphis on the waterfront and in front of Elvis's Graceland on my trip from Texas to here in 2010. Unimogs of this type were almost never known to travel 750 miles on a trip, though they often complete the Paris to Dakar Rally (usually they don't win, but the pretty much always make the finish line even when more sophisticated vehicles do not).
Good luck!