This one can traverse almost anything and it's fully amphibious - amazing:

http://denver.craigslist.org/for/1978340131.html

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1987 Mercedes 300SDL; SOLD
1985 Mercedes 300D; SOLD
2006 Honda Pilot - wife's ride; 122K;
1995 Toyota Land Cruiser - 3X locked; 182K

I have always wanted one of these! Too bad its um....financially out of reach (understatement). I could probably adapt some tank tracks to my 300SD

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TC
Current stable:
- 2004 Mazda RALLYWANKEL
- 2007 Saturn sky redline
- 2004 Explorer...under surgery.

Past: 135i, GTI, 300E, 300SD, 300SD, Stealth