Marathon and other side-wall failures

[flitzwhopper]

At the risk of throwing salt in what appears to be a gaping wound, I've got some Primex HW 100XT tires on my 24' Argosy and they seem to be very stable. Granted, they are loaded at less that 1250lbs each but their performance at high speeds on Arizona roads has been impressive. They seem to be Canadian tires and may not be widely available in the US. Has anyone even heard of Primex. It seems as if their primary claim to fame is industrial and long haul tires.