Wayne,
You previously asked about hubs.
Your hubs look like 5-on-4 1/2. Five holes on 4 1/2 inch spacing. That's the standard. You can run most 13, 14, or 15" (diameter) wheels on them. The larger the diameter, the fewer times the hub rotates on its bearings per mile, the cooler they run and the longer they last.
If you don't already know, trailer tires (10-ply) radials are better than passenger tires because they are built stronger and are therefore safer. (An important issue on a single axle trailer with only two tires.)
Prem
My goal...
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...is to live in a trailer.