In this video I install the axle on the beach cart. I used galvanized pipe, it does have some rust from saltwater use this summer, other options such as aluminum may suit your needs better if this is a concern.

Amazon wheels that should work well
https://amzn.to/42McSgC

Stainless lynch pins to hold the wheels on
https://amzn.to/3r6J3dM

Parts list.
13” balloon wheels with 1” axle hole
1" sch40 pvc
3/4" galvanized conduit
1" galvanized conduit clamps (pvc clamps may work if glued)
1/4" lynch pins x2
#10 x3/4" stainless pan head sheet metal screws x8