A few months ago I bought a set of BFG KO2s for my Tundra at 4WP. They were able to beat the price at Costco and included a full warranty.
After the install I noticed some vibration but just didn't make the time to go back. Today I had my truck's oil changed and tire balance checked at Toyota. They told me that two of the tires had "excessive road force" and were most likely "out of round". They said that it is not uncommon to get a bad truck tire every now and then. Service at Toyota said that they needed to be replaced in order to get rid of the vibration.
I took my truck to 4WP on my way home and they swapped the tires in question out for new ones. Glad I purchased my tires here with the warranty. Thanks for standing by your products 4WP!