Just sold my 04 dually 4x4 nv5600 for 8000 overbook! Bought a new 2015 megacab sb, srw. Tow capacity is 16660! Gvwr is 12300. The new trucks interior is the best! Aisin trans, 385 hp, 865 torque. 5ver weighs 12200 dry and hitting 14000 ready to go. Advantage of srw is car washes, parking and tires! Only 4 not 6.. Dually advantage 6 tires, greater gvwr.. The new Rams are the bomb... Imo....I got 19.5 mpg with only 1800 miles on truck hiway. Pulls Montana 2610 rl legacy with ease..reason for a dually is added gvwr. If your load or hitch weight is too heavy for a srw, then dually. On the ram 3500 we are talking 1700 lbs more capable. If you want a big cabover, then it's dually..the dually is also more stable in heavy winds.. But, when it's time for tires.........NOT FUN,!