The quad cab has a smaller back seat and a larger bed, the crew cab has a larger back seat and a smaller bed. To compare them you can go to http://www.ramtrucks.com/en/2011/ram_150... and select the Build My Own option from the bottom of the page.
Heart muscle thickening (called cardiac hypertrophy) can be a healthy response to exercise and pregnancy; however, it often occurs in people with high blood pressure, diabetes, heart failure and certain genetic conditions.
Gradually, as more cocaine is used, the heart responds to this stress by thickening certain parts of the heart. A thickened heart is less flexible and pumps blood poorly. This thickened heart tissue can prevent the flow of blood to the heart muscle itself.