You must not have looked for tires recently. Finding 19's is easier than 17's and 18's now, especially when you get above about a 255 for width. When you get up around 295 there are more options in sizes with 19's than 18's, one of the reasons I've started looking at some 19" rims for the back of my car.
When I bought the 275/35/18's and 295/35/18's for my Duster there were a bunch of different tire options for me. Now there's like 2 that cover both of those sizes. In 19" it's a piece of cake. Not to mention if I do the "reverse mini-tub" on my Duster I may be able to go to a 305, and that would pretty much require a 19" in the back to get that size.
