[MrForbes]

It's a neat design. I wonder about the turning ability though...we are working feverishly to get our 8wd prototype running (hopefully today) so we can drive it around on carpet and on the bump. We are keeping the wheels fixed, but with spacing kind of like what you have--not evenly spaced, center wheels further apart longitudinally than the end wheels. With the end wheels raised just a bit.

We really like how 6wd robots drive, but were concerned about the bump, and we think the irregularly spaced, drop center wheel 8wd might be a good compromise between all the designs.