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.
It's the most common heart problem seen with Noonan syndrome, and it may occur alone or with other heart defects. Thickening of the heart muscle (hypertrophic cardiomyopathy). This is abnormal growth or thickening of the heart muscle that affects some people with Noonan syndrome. Other structural defects of the heart.