learn me about tires

The C and D tires probably have the same number of plies. The "ply rating" thing is a throwback to the old bias ply days...

Jebby14 wrote:
trailer runs around 4500lb loaded. 4 wheels down I should have plenty of capability with a c load rating right?

Yes but if your rims are rated for a higher air pressure (65 PSI), why not get "D" range as you'll gain two plies and probably won't pay more.

trailer runs around 4500lb loaded. 4 wheels down I should have plenty of capability with a c load rating right?

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You're going to get a lot of recommendations for Maxxis and LT tires. Both are good suggestions. I'd suggest to cross the border and visit a Discount Tire (or similar) and see what they stock. I put new shoes on mine two years ago. I bought Carlisle Radial Sport RH in load range D. The price was right and I have a bit of faith in their construction. They are also stocked across the country so if I need another one, I won't have to order and wait for a tire.

I've had good results with Maxxis tires. Get the heaviest rated tire available for your wheel size.

Go North. Even with the exchange rate prices are lower in Michigan. We have only 6% tax in Mich compared to your 15%. That will help on the exchange rate. I would get the heaviest duty tire possible for your weight. I was in Windsor last Friday.

When we had trailers, I went to LT (light truck) tires, 1 size larger, and the highest load range. As for brand, back in the day, I mostly used Atlas truck tires or if they were not available Goodyear tires. Now days I would go with either Kendra or Maxxis tires.

Etrailer.com had the best prices I could find last year.
Get the heaviest tires you can. Presume you have 14" wheels, there are a couple D load 14" tires available.