I would go air bags over new springs.. When not towing you can drop the pressure in the air bags for a better ride.. cannot do that with springs..
Sway bar YES.... bigger is better... 3 months after putting the biggest sway bar on my truck that I could get a semi on I-15 forced me off the road.. while towing .. I firmly believe that monster Helwig sway bar helped save my life or at least my truck and trailer.. I also credit the Hensley Arrow hitch...
2004 Chev Silverado Duramax optioned past the max. 2009 Jayco Eagle 308 RLS 765 watts of solar, 6-6 volt batteries (696 amp hour), 2000 watt (4000 surge) whole house inverter.
140 days boondocking in 2016
211/2015, 196/14, 247/13, 193/12