I've packed a couple small elk (not at the same time) in an ordinary, garden variety wheelbarrow. With the weight over the wheel (unlike many carts), it's easier than it sounds. Up hills is a bugger with any cart but on the flat or downhill, it works very well. With only 1 wheel, it's much better on narrow trails or through rocks, etc. than a 2 wheeled cart. I made a couple rope loops around my wrists to hold it back on downhills. That helped a lot. Just keep the loops big enough so you can let go in a hurry if it gets away from you.
Note: do NOT use a cheap, flimsy wheelbarrow. Use a good sturdy one or you might end up packing both the deer and the wheelbarrow.
If the trail's steep, rolling the cart or wheelbarrow in, even though it's empty, gets pretty tedious.
