Heck no! Help yourself.
I used 13x5.00 wheels/tires meant for use with a 3/4" axle. Found on
amazon as I didn't like the HF offerings at the time. They are pneumatic, not solid or run flat types. The tube between the wheels is 1" square 11 gauge steel. A 3/4" bolt fits inside that size steel tube with a little file work on the weld inside the tube. I bought some 8" x 3/4 grade 5 bolts, cut the heads off and inserted them in the tube. A flat washer was welded to the axle as a stop for the wheel bearing to ride up against. I used nylock nuts; good enough for a slow speed service as this.
The tire track is 22" measured from the center of one tire tread to the others centerline. 15" from axle centerline to the caster pivot.
Most of the steel was scrap left overs. The ball is welded to a piece of inner receiver tube. It fits into an outer receiver tube. Holes drilled to adjust height. I used a 1 7/8 ball. It works with a 2" coupler well enough for the purpose. The caster is from HF. The handle is removable just because I could. I've never removed it since painting it and reassembling.
Some day I may build a motorized one. I have plans and parts list but figure it'll cost $3-400 in parts so I'm in no rush unless I decide I need to push it up the sloped driveway. Uses an ATV winch for power and ATV wheels/tires for traction grip.