[caffel]

We have used 4 WD and 6 WD.
Ironically, six turns better. The reason is that the middle wheels do most of the turning with very little skidding.
This year we used the kit chassis with a little rock as designed in and six traction wheels, 1.5 " wide When the drive was running well, turning was fine and traction was excellent, climbing all ramps and pushing well. When we had trouble with the digital filter and voltage to the motors was down to 10.5 v, then turning wasn't good enough.
Next year if turning becomes a problem or if pushing is de-emphasized we'll use narrower traction wheels on the corners.
The year we used omnis at the corners went well, but they broke easily and climbing was only adequate.

C Affel, mentor 423