Thank you for your reply, NC Roamer! I did weigh our FS on one of our first trips, and loaded for travel our concern was certainly over the rear axle of the coach. We have been able to keep our weight just under the max, with room to spare over the front axle. Our front axle came in at 4600lb. , so we are ok with the front hitch. The FS and FK are slightly different, as our large slides are in opposite locations. I think that makes up the difference in the FS being lighter in front.
2015 Jayco Greyhawk 31FS