If your lucky this won't turn into a dodge vs ford vs chevy debate.
I will only tell you from my experience that my 06 Ram 1500 Mega Cab has been an excellent vehicle for our family. It runs the 5.7 and I will pull 20 mpg highway, around 12 in the city and about the same towing anything. I believe that later years added the MDS motor and fuel economy was better. You won't find a cab with a bigger interior, rear seat legroom is about a foot bigger than the quad cab and then there is another 8" behind the rear seats which also recline. My kids hate sitting in the back of any regular quad cab now, they have been spoiled. Reliability has been awesome, only warranty issues were sway bar end links, and a power distribution module short on the trailer lights (fuse box). It was only available with a short box (6'6") but was on the quad cab long box frame, so Wheel base is around 160", good for towing just about any length( std hitch) RV without sway issues cropping up.
Lots of really clean ones around the south as well.
Ross..
My Rides
1985 250R original (Garage Queen)
-under restoration
1985 250R black and blue full rebuild ( Daily Rider)
-Paul Turner pipe
-+2" Westcoast
1985 Red and White Tecat-EH Sold
1985 Green Tecate Sold
My Wife's Ride
-2003 Suzuki LTZ 400 Showroom fresh and completely stock
My Kids Ride
-2004 Yamaha Blaster, Completely Stock
-2006 Yamaha Blaster, Completely Stock