Just going to add a few more things in answer of your question. I can tell you from experience in comparing the 2 wheel and the single wheel, that the single wheel is much more user friendly, if you have two or more people. The single wheel will role through brush easier. You can keep it upright and balanced on side hills. It roles over rocks and logs without kicking from side to side like two wheelers do. Strap the load down tight, and balance is not a big issue. Just make sure the load is centrally located. I also built a two wheeler for when I'm alone and hunting on flat country like when I hunt antelope. Using a good cart like the one I explained above will put you way ahead of most people. Use it to get your gear into a camp away from the roads. Use it to bring out the critters when successful. We will quarter and bone a whole elk and can roll it out in one trip without even needing to stop in some cases. We like to hunt up long drainages so it is a fairly gentle downward slope going out. Gravity provides the momentum. We just balance the load and try to keep up. In some cases we backpack the meat down off the steep stuff to the cart. After that a cart beats the heck out of packing and dragging. I think they are at times even better than a horse. No rodeos, and no expense all year, ( vets, feed, gear/tack, you get the picture).