We bought our 2012 30 ft FC about a year ago. Had the dealer install a Resse dual cam hitch, he used 1200# spring bars. We've put about 3000 miles on it and like the set up, no problems with sway on the Interstates or with big trucks. We did notice a very stiff ride especially on the bridge approaches. Other AS owners had cautioned me that the 1200# bars were to stiff for use with my F250 diesel and I should consider dropping down to 800# bars and that I also should check for missing rivits. After a trip to Florida, I checked for missed rivits and found three missing, two interior and one in the belly pan, all were in the front area of the trailer. I am not a hitch expert, so I talked with an etrailer tech rep (etrailer is in our area)who also felt the 1200# bars were too stiff and also suggested 800-1000# bars. I received my 800# bars this week and did a 50 mile drive on I-70, everything seemed the same except the ride seemed softer and the bridge approaches were definetly softer. No change in the overall handling of the truck/trailer.
I used the same five links under load with the 800# bars. Front and rear fender measurements with the 800# bars were within 1/4 to 1/2 inch of the 1200# bars.
FWIW, the TW (using Sherline scale) is 900 lbs. Trailer is loaded with everything except food and clothes.
So far, the lower weight bars seem like a good thing.