I made two sleds, with two sized wheels. The first one has lawnmower wheels, and the second have pneumatic 8" from Harbor Freight (on sale).
This one just folds in half, as the cross pieces are screwed in place:
This one fully disassembles. . Its very strong, and can handle allot of weight, the axle is a metal rod going across both to both sides. It limits clearance, but is great for my use:
Im 210 pounds +/-, and have ridden both sleds down my driveway (I dont recommend it, but it was fun), so they will handle reasonable weight. The air filled tires cushion the bait and power auger from too much bouncing around.
Hope this helps,
Kb