I am always needing to put tires on some items that I use such as large
fans, homemade generator/s, carts, etc. I have used drill-rod once in an
emergency. Other times, all-threaded rod but I know there is other
material that has to be cheaper.

For some larger items to be wheeled, you can't beat the entire rear axle
with tires and wheels from a small front wheel drive car. Available at any
junk yard.

Karl