The Georgetown comes in two flavors. A regular Georgetown and the Georgetown XL. The XL might be a few more dollars but comes with really great upgraded options that may or may not be in the regular version.
So the model and the options will be your choice.
Now to the Ford V-10 chassis
The engine is solid as a rock and can easily pull a car on the highway at 65 mph if you like with no effort. The new 2016 and on have a 6 speed transmission that sounds like it down shift less the older 5 speeds.
I have travelled up many mountains around the US that range up to 10,000 ft with 10% grades and the Ford V-10 has no issues in pulling you up at a reasonable speed. Now the engine will work hard on steep hills and you will hear much of the noise from the engine during these climbs but that should be a small percentage of the time when travelling cross country. Fuel mileage expect 7mpg or so and diesels get maybe 1 mpg more but you have to think about the additional costs compared to a gas rig.
I have a Georgetown XL 378TS which is on the same 242" wheelbase cassis as your model. 22.5" tires are a must for longer distances which I really like. The one piece fiberglass roof was one item that made me decide to buy as well as the full body paint instead of stickers.
If you are planning cold climates the electric fire place is a great to keep the chill off inside and you do have two gas furnaces on top of that. They also have what they call Artic Pak which has small heat plates on your tanks as well as any water elbow that may be effected by 32 degree weather. They also have double pane windows as an option which is great for hot and cold weather but also dampens outside noise a great deal.
I have carpet and linoleum on the floors but some have now tile which is nice but adds a lot of extra weight and they have had issues of stress cracking after awhile.
My 2012 Georgetown has almost 50,000 miles and I have had issues in the first year just like everyone. Expect things to surface in the first year and this is were a good dealer close by will take care of warranty issues. You know you have a trailer.
Oh if you have $250,000 and want the extra expense of a diesel pusher go right ahead. You will be able to carry lots more stuff but remember the added cost comes with higher price in fuel, diesel additive juice, oil changes, high prices air, oil fuel filter.
Now I can go on and on but I will let other chime in and give their opinions so you get a good over view of the Georgetown.
I for one have been very happy with mine and plan to keep rolling for another 50,000 miles.
Before I go never pay the listed price. You can easily get 20 to 30% of that price depending upon the time of year you buy as well as if you buy a 2016 at the end of the year or a new 2017 at the beginning of the year.
Bottom line enjoy the journey and have fun.
P.S. Being in Springfield IL you are close to where they make the Georgetown in Elkhart Indiana