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.
Cardiomyopathy is a chronic and sometimes progressive disease in which the heart muscle (myocardium), is abnormally enlarged, thickened and/or stiffened. The condition typically begins in the walls of the heart's lower chambers (ventricles), and in more severe cases also affects the walls of the upper chambers (atria).