Transporter tires

Has anyone heard of these tires? The local tire shop sells them and said they have been working out well for them. They have a wide rib pattern which I like so that rocks don't get caught up and pushed through the tire. I travel a lot on dirt roads. My fifth wheel weighs about 8,000 lbs full, and I found that the tires that were on it were only C rated, and these are D rated. 65 psi compared to 50 psi. I could not find any pressure rating on the wheel, only 6X15. I always watch the pressure, and keep my speed down. The price was right, and I only seem to get 12,000 to 15,000 on a set of tires, so I bought a pair. Now I am hoping I didn't goof up, I can't find anything on them. They, of course, are Chinese along with nearly all of them.

Mike