You stated that the tongue weight is the same so why would you bother with heavier springs? Unless your having trouble now.... Tow with it as is see how it handles and go from there.. by the way dry weight means nothing.. you never tow like that the fully loaded weight is the important number...
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