I got bashed for running 37s on this forum but all of a sudden they all simmered down after a year of adventures, I can not wait to see what responses you get considering a couple members swear by their 33s as the godsend of an off road tire size.
Back to the topic, I am currently running Milestar Patagonia MT 37x12.5R17 and can not wait until their 40x13.5R17 arrives later this year. It's quieter than any same size AT tire, weighs less than any other tire on the market, 10ply, M+S rated, and LT.
Really looking forward to see where this discussion goes.
I was able to get "some" information from Tireco (Milestar importing distributor) regarding the 40" Patagonia MT's. They should have a shipment of them arriving in about 40 days. Their online catalog is not correct on the weights, but of course, they cannot confirm the weight of the 40" tire yet. They have the weight listed essentially the same as their 38" C load range tire (one tenth of a pound difference) which they confirm cannot be correct. But, they do not know which tire is incorrect on the brochure or if both are incorrect.
I'm not sure I want the "lightest" tire available when compared to other brands of the same size.....if the tire is lighter then there is either less rubber, less belt(s) thickness or a combination of both. I don't want to jeopardize strength to save a few pounds.
I'll follow up in a month or so and see what they say then.