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Originally Posted by Andrew Schuetze
A six wheel system will drive straighter and draw less power. One can gain back some manuverability by lowering the center wheels 1/4 inch or less.
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again, this matters on tread material and width. more width means more scrub which means it tracks straighter. and in the designs with center idlers or lowered center wheels, so you cannot necessarily say a 6wd will track straighter. espescially if it the frame gets tweaked a bit.
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Do six wheel designs exist that can approach the obstacle drivability of a track system? 
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the mars rovers? in a independent suspension view i think 6wd will have better obstacle drivability. but with zero suspension i think treads may have the advantage of being able to angle their treads at the front as in to climb over higher objects. but if the wheel for 6wd and pulley for tread were the same, id say it matters on what obstacles you want to clear. as in sand tread will distribute weight more but in rockcrawling and w/e you probably want a bit more stuff to actually "claw" at the surface. meh. i dunno