[lukevanoort]

I'm going to go out on a limb and say that with a coplanar 6WD, assuming that you use the same wheels, you could quite likely end up with more traction than a 4WD. Now, here's my reasoning and it is completely unrelated to any idea that "more wheelz equalz more trakshun dudez" or any similar thinking. With a coplanar 6WD, you end up with significantly less load on each wheel, and this results in less wear. With some tread materials, traction will reduce as the tread wears down (think about what happens to old sneakers). So, since the 6WD reduces wear, you might end up keeping your wheel's high initial traction for longer. Probably not a big effect (especially if you can replace treads like with IFI wheels or have smooth wheels anyway), but it is something to consider.