I've tried all kinds of carts including a wheelbarrow. Most work fine on downhill but are horrible uphill even on very slight inclines. Flat land isn't a lot better. They get very tiring very fast. If it gets even remotely steep downhill, a 2d person on a drag rope is a huge asset.
Around here, 2 wheeled carts are useless because of narrow trails, rocks, and slopes. I've never used a bike to pack game but a lot of guys seem to do it.
I once packed a small elk out 4 miles in a wheelbarrow on an old logging road. It was mostly downhill but the few uphills were real killers. I tied ropes to the frame to make hand loops to hold it back on the downhills. That saves the hands. Just keep the loops big enough so you can let go if it gets away from you. The hardest part of a wheelbarrow is keeping the load over the wheel. It's top heavy.
