Wheels are good if you have a chansaw and are cutting up your own trees. Often though, whats available is stuff cut for the fireplace. Here's how I deal with fireplace-sized round logs and limbs:
I've got something called a "monster maul." Its a big triangular piece of solid steel with a steel pipe for a handle. It will split up to a 12" round log with one solid hit. I keep splitting till the pieces are no more that 4" thick. Then I make quick work making chunks with my skill saw. For limbs of various sizes (1" to 6") I prefer using a sawzall.
If the stuff is green, I let is dry out for a few months, keeping it off the ground and away from the house to prevent termites.
Dr. Mark (STL)
Ph.D. (honorary) Bovine $hitology
A thin line separates paranoia from an acute understanding of reality.