[thefro526]

Originally Posted by Akash Rastogi

Yes you will want to run chains to all six wheels. Unpowered wheels are dead weight.

Stogi's pretty much right on the money here.

Every 6WD we've ever build has had each wheel powered, usually using two chains on each side. The front and center wheels are chained together and the center and rear are chained together - we use this method to add a certain amount of redundancy to our drive so that we know we can throw one chain on each side and still have some degree of effective maneuverability.