I have a 2008 Georgetown 340TS. I had a very squeaky kitchen floor. I was recommended a repair technique by FR that I was very leary of doing but it worked.
I was replacing the vinyl flooring with vinyl hardwood strips anyway so I gave it a shot. I removed the vinyl (removing it anyway). I took a 2 inch hole saw and drilled 3 holes in the general area where it squeaked. If you hit steel when you drill, don't worry, just move to the side about 2 inches and drill again. Save the wooden circle that you cut out.
Once the hole was cut, I cleaned out some of the styrofoam insulation from the holes (as much as I could reach with a small screw driver). Try to get as much styrofoam removed near the squeak area as possible. I then filled the holes and as much of the open space with high quality insulation foam. Use a genorous amount of the foam. Don't walk on it until the next day. Although it sounds like the squeaking in a house floor, what you are really hearing is the wood floor rubbing against the metal joists. The foam will fill the area between the metal joists and the wooden floor.
The next day, I was shocked. It worked. It really worked. It has been about a year now and there is still no squeaks at all. I hope this helps.