I wanted a cart that put the weight over the axle and found this little jewel. It's a Sherpa, folds up, aluminum, made in the USA, and weighs about 15 lbs. Price $150. I added some XOP backpack straps, padding for my hands, and ditched the hitch pins holding the wheels on for cotter keys.
Last week I used it for the first time. I hauled a 150 lb sow out of a Florida swamp and over a sugar sand horse trail back to the truck. About 1 1/4 miles in total. It puts all of the weight on the axle and pulled like a dream. It didn't wear me out at all.
Now all I have left to do is to make the sausage!