The truck has a 52 gallon tank mounted in the rear of the frame. You can order it with a second 22 gallon tank, mounted mid frame. If you add any body to it, you may be able to add a tank in or on the body as well.
Ram 4500 Chassis Cabs are already available (2014), including Ram 5500.
check on dodge.com. only busisness link dealers will have the 4500 and 5500 trucks
Alldata says 148ftlbs for 2008 dodge 4500/5500
Mopar 5083285AA
The 2009 Dodge Charger's engine produces 178 hp @ 5500 rpm.
The 2010 Dodge Charger's engine produces 178 hp @ 5500 rpm.
The automatic uses Mopar ATF+4 unless it is a 4500 or 5500 chassis cab, then it uses special fluid from Dodge for the AS68 trans. The manuals used 5w30 until 1993, the 5 and 6 speeds from 1994 to 2005 used a special manual trans fluid from Dodge. The 6 speed after 2005 uses Mopar ATF+4.
The 2500 and 3500 do not. The 4500 and 5500's do.
Dodge 4500 and 5500s come with a Dana S111 on the rear and an American axle (no model number) on the front.
350 hp
That will vary from state to state.
5500, to the nearest hundreds, is 5500.