BFG AT's are my tire of choice. Recently had to buy 2 new ones. 15's were more expensive than 20's and not in stock. A pair was found at another store and had to be transferred. Used to be you couldn't throw a lug wrench without hittin a 15" tire. I destroyed one in a small town once and the ony 15 I could find was a used 30" street tire.
I like those 7-spoke Nissan wheels, but they seem only available in 17". The 20's are a 6 spoke