I'm beginning to think tire manufacturers have one of the worst quality control processes ever. It doesn't seem to matter the brand, someone.. somewhere has had problems. Posters on CasitaForum seem to favor Kuhmo tires which are manufactured in Korea. I'm running 15" Marathons and haven't had any problems (knock wood). Others avoid Marathons like the plague. Who's to know what's the best?
At any rate, here's a link to Kuhmo's in Canada. I don't know if they're available for your size application:
KUMHO Tires Canada.
Let us know what you decide Pat.