As it was explained to me, the newer rigs, especially ones like the Georgetown that have the 22.5" wheel size, is that most owners don't change their own tires but rather call for roadside assistance. Therefore it's not necessary to carry a spare, just have them bring one. The other reason is that you probably wouldn't be able to lift the spare on the tire into a "trunk" or storage area due to the weight. This is the reason that many just carry an unmounted tire. Our 2009 has a "trunk" in the back with a space for the spare.
One thing I should caution you about with your new rig. The front end alignment is rarely right coming from the factory. Forest River will only cover the cost of an alignment for the first 90 days of ownership, hardly enough time for you to see that anything is wrong. We found out the hard way that ours was way out of tolerances on the toe-in and went through a set of front tires inside of 1 year. That's an $878 bill from the tire store for new tires! Therefore I highly suggest that you call Forest River as soon as you get your rig and tell them the steering or handling doesn't feel right and demand they pay for an alignment. I really wished someone had warned me about this when I first got my rig. This isn't only a problem for FR but many other manufacturers as well.
Congratulations on the new rig!