It takes a bit of calling around, but I have been able to find them on the road, as they are often used on trailers. However stay away from Bridgestone (same as Firestone) When I converted my 1978 16' Dolphin from single to dually, I installed a set of 4 Bridgestone, Load Range "D". NONE of them died a natural death. After the first one blew out at freeway speed, I started inspecting them often. I discovered that the warning sign was when the steel strands started to sprout through the tread, like it was growing a beard.
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