You're right, the Ford dealer will do the alignment as long as they have the large vehicle equipment. I'm not certain if all Freightliner dealers will, but the shop here NE of Atlanta will also do the alignment on a Georgetown.
I also recommend getting an alignment within the first 90 days of buying a Georgetown. Our salesman casually mentioned getting an alignment at the Ford or Freightliner dealers, but I didn't pay much attention. Now after only 7000 miles, I'm close to needing a new left-front tire. I found discussions in IRV2 where several owners had to have alignments done soon after purchasing their Georgetown.
I mentioned 90 days, because the alignment is not a normal warranty item, but apparently it's considered necessary. That's because Ford will perform the alignment on the chassis, but they don't know what Forest River will build on it. I can't say for certain whether or not FR will do an alignment on each coach, but mine wasn't and several other FR owners had similar problems. Some owners said that FR covered the expense of an alignment up to $250 if done within 90 days. I brought mine into the dealer a few days before the 1-year warranty expired for some repairs, and I'm negotiating with the service manager about the alignment. I'm not sure if I'll win, but it's worth a try, because our local Ford dealer said it would be $150.