[patrickrd]

I know there has been a recent thread on this (so you should search for it) but in short:

Theoretically there is no difference according to F=mu*N ... ln actuality, adding more wheels will help you a little bit.

My suggestion is to try to get material or shape your wheels that can dig into the carpet a little. This is hard because I think I heard the rules on wheels are strict this year... But if you can come up with a way to legally add "cleats" to the wheels like soccer players use to dig into the ground, that will help you the most as far as traction is concerned... A lot moreso than adding wheels.

Also, do some experiments to find the answers you seek... we can theoreticize (i don't think that's a word...) this all you want but every wheel with every surface behaves differently. Emperical data is great in these types of cases.

- Patrick