I have an old cart that's in good shape except for the axle area. The bearings had been shot for a long time and I didn't notice. Put at least two waterfowling seasons and a bunch of drags during deer seasons before I realized what was up.
It's been lying out back in the weather for a few years behind the house.
If it isn't in too bad of shape, I think I can buy a threaded rod, some square tubing, nuts, washers & bolts, and four wheels and make my own version of The Hawk Crawler. It'll probably look pretty bad compared to theirs, so I could get away with calling it The Creepy Crawler.