HDR is of course correct, but, I also said and meant to convey, it was a common size that is used on these newer cargo trailers. Meaning, it should be easy to match up since it IS so common.
And recently manufactured, more or less generic, cargo trailers seem to use a couple of very common size wheels and tires.
My 5x8 trailer uses 13 inch, 4 lug wheels and tires, and my 6x12 uses 15 inch, 5 lug wheels and tires. I have 3 other trailers that use different sizes also. But within the narrow range of the type and year trailer that Dean has, I think he can find it somewhere. Yes, sizes vary. But once you narrow it down to a wheel size, the lug pattern is easy to match up at most any store or dealer that sells this stuff.
To be 100% certain, just take the wheel and tire to your favorite store that sells them.
