This is only my opinion and personal preferences ...we all have our own opinions on tires so please understand that this is only my own opinion and others will disagree:
1. Go the middle road pertaining to price and spend a bit more and go with a Toyo, Yokohama, or Sumitomo.
Long March is a Chinese brand tire that is very popular in very heavy duty applications there in Canada. I'm not sure if it is actually made in China but it's a Chinese company. For me, I prefer to stay away from tires that are made by Chinese companies. Yes Chinese-brand tires are much less money. Some are good values, others not so much. Chinese tires have come a long way in the past few years especially in the commercial trucking industry because of their low prices and increasingly better quality. LongMarch has a good reputation, however, especially in Canada.
2. I personally prefer tires made by the Japanese (or South Korean) companies. The are a bit more money than the Chinese branded tires but much less than the first tier tires like Michelin, Goodyear, etc.
3. Toyo is a very popular replacement for the OEM Michelins and if you do a search on this forum there are dozens of threads on the subject and you'll see that it probably is the number one choice to replace Michelins. The parent company is a Japanese corporation.
4. Yokohama and Sumitomo commercial truck tires are made by U.S. subsidiaries of Japanese companies. Good value and you're getting excellent quality for a good price. They both have plants in the U.S. that produce commercial truck tires so you in all likelihood would be getting a product that was produced in the U.S. with those two brands.
I too would encourage you to stay as close to the OEM size as you can. That way, you don't have to worry as much about clearance issues or distance between duals, etc.
Therefore, as others have said, go with size 245/75R22.5 which is considered the closest replacement to the OEM Michelin proprietary size 235/80R 22.5
My top choices for a 245/75R22.5 would be:
1.
Toyo M154
2.
Yokohama RY103
3.
Sumitomo ST719
They will all be a bit more in price than a LongMarch ...probably in the low $300s a piece but not sure in Canada. Have your dealer price those three so you can at least get an idea of where you stand in comparison to the Long March.