If you get a quad cab (like mine) you get a full sized bed. If you get the newer crew cab you lose bed space.
The QC is not huge by no means but a adult can sit back there confertably.

Generation 3 -
Dodge Ram Produced: 2002 - Present
Body Type: 2 Door / 4 Door
6.5 / 8 ft bed
Engine Size:
3.7L Powertech V6
4.7L Magnum V8
5.9L Magnum V8
5.9L ISB Diesel I6
5.7L Hemi V8
8.3L Viper V10
Dodge only offers two bed sizes and if I remember correctly, the Mega Cab doesn't come in long bed.

Dodge only offers two bed sizes and if I remember correctly, the Mega Cab doesn't come in long bed.
I believe you are correct.
I met a guy once who extended his frame to fit a longbed on his mega cab, and DAMN was that a long truck.![]()

Bed lengths are different as might be frames. One more than the other. I'm unclear as to which one, but it is absolutely one of them. Don't hold me to that though, it could always be the other one. Sometimes I get confused.
That makes sense to me 
