You should be within specs, I know I am, have a 2017 F350 SRW FX4 and towing a 3725 which is very similar to your stated floor plan, if you are nearing the pen weight max, and only you will know, I recommend to not load the front storage with heavy stuff. If you must carry heavy things in the front storage to many places and for many years/trips then maybe a dually. I think we should always be as easy as possible on the rear end, be it a dually or srw.
