I broke the plastic Hobie wheels bouncing my fully loaded yak off a curb on the way back to the truck... I wanted something, wider, stronger and less expensive than the nice fat Hobie sand wheels.
HFT had a sale: $5 each. Axle cost $9. Bolts, washers, nuts, cotter pins, $5. total rated capacity for this should be over 600 lbs...more than needed for a 180 lb PA14!
The hubs on these bolt in, so I replaced the bolts with longer ones to create dualies and threaded the end of the axle for a nut with a cotter pin to keep it from walking.