I had a 2001 Dodge 2500 4x4 with overload springs, that was high for my first 5th wheel. I ended up putting a 4" lift on the trailer after flipping the axles. I had a 4" lift put on my Crusader to level it out as well. I just bought a '14 3500 and it's an inch taller at the top of the rails than the old truck. The hitch is being installed on Monday, so I should have a good idea how it will match up.
Retired with not enough time on my hands
2013 Crusader 260RLD, towed by 2014 Ram Laramie 3500