SRW doable? Some will say, change tires, add air bags, use an alum hitch. Problem is you CANNOT change weight ratings/capacity of truck. Period. If you had nothing whatsoever in truck or 5er, then yes you could, but what fun is that w/o family, personal items and food?
Yes the new tow ratings from GM has caught many attention for SRW, but IMO, you will find you'll max out real quick even with a 3500.
Let me give you a personal example:
Dec '14, bought a '15 F350 SRW,4x4,cc,sb,6.7. Added/replaced factory fuel tank w/a Transfeflow 50 gallon tank. Truck scaled out at 8700 w/o anyone in cab, GVW of 11,500. Had a '06 Cedar Creek Silverback w/ dry wt of 10,800, max wt of 13,800. Fully loaded netted 2,000 pin so 10,700 on truck, total gross of 21,500. All within legal limits of truck all the way around. ALRIGHT I said! Truck towed awesome with this coach.
Enter 2017 and we upgrade 5ers to a '18 Big Country with a advertised dry pin of 2,888, dry wt of 13,420 and max wt of 16,000. With same '15 F350, fully loaded and B&W Patriot, I now had 3740 pin, 7360 on truck's rear axle, 12,350 on truck, gross combo of 24,470. 5er's actual dry weight was 14,000. Truck's axle capacity is 7,000 and max combo 23,500. So now I'm over all the way around. Added upper/lower Stableloads, but ended up taking the uppers off. Truck towed this coach well also, but had to be in mindset that I'm over and keep a safe distance between me and vehicle in front. Towed to Maine from CNY w/o any problems.
2018 comes and now our vaykay plans have us leaning towards FL in Aug. Knowing I was already over on truck (which this didn't bother me too much), but over on the tires planted a huge gut feeling in my stomach that wouldn't go away. Just knowing the normal heat generated on tires, add in the extra weight on them, higher air and road temps down south wasn't setting too well w/ me. Needless to say, bought a '17 F350 DRW, cc,4x4,6.7. Hated to part ways w/ the '15, but after towing down/back, wife driving part ways and her saying she felt better driving/towing w/ the DRW vs the SRW (when she doesn't drive/tow a lot), knew after all this it was a smart decision. Yes I still miss my SRW truck for bopping around town and towing my snowmobile trailer as well as just having a SRW in snow, but the DRW was the way to go and would highly recommend the same if your looking at a trl wt closing in on 16k. IMO, SRW are good up to 14 to NO more than 15K max trailer weights. Just the piece of mind the DRW brought to me w/ wife towing this much weight was worth it. FWIW, the gut feeling went away except now having to pay for it! LOL