Been there, Done that!
Hi WIngnut,
I had a similar problem a few years back. In my case I was tired of trying to find 14.5" tires for my trailer. (They are used on mobile home axles.)
Anyway, If you want a more common wheel, all you need is the bearing numbers and the drum diameter.
Check out this place...
Pioneer Rim
I bought 4 hubs / drums for my trailer there, and they worked out great! I went with a 6 bolt hub, and 15" wheels.
Good luck!