I had defended Carlisle tires earlier on iRV2 after owners complained of multiple failures.
My reasoning: if I aligned my Roadmaster dolly perfectly, checked that sidewall inflation was maintained (sidewall values are for trailers/dollies), monitored both tread wear and operating temperatures, and cruised under 70mph, all would be fine.
Boy, was I wrong... I gave Chinese-made Carlisle the benefit of the doubt after the first catastrophic failure. After all, witnesses reported that my wife had allowed the right dolly tire to fall off the pavement in a construction zone; I guessed that she'd hit a hard edge or maybe some debris.
Several days ago, the next tire blew out at 57mph, sitting in the slow lane of an Interstate. It was the driver's side.
Enough is enough. Both have taken place before the tires accumulated 3,000 miles of use, which matches the experience of countless other owners.
I have filed a consumer debrief to the NHTSA, removed the remaining tire from service. It is a spare for emergency use only. Roadmaster's staff is meeting this week to determine if Carlisle needs to be abandoned as their OEM tire brand (apparently, other manufacturers have already begun installing safer tires on their dollies).
I've passed along my observation (link below) to the FMCA Forum, and it is being relayed to my friends at the mammoth iRV2 forum (I resigned as a Senior Member there after discovering moderator inconsistencies).
http://community.fmca.com/topic/4130-carlisle-tire-safety-advisory/