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.
Pleural thickening is a lung disease that describes a scarring, calcification, and/or thickening of the pleura (the lining surrounding the lungs) often as a consequence of the inhalation of asbestos into the lungs. If the asbestos fibres work their way into the pleura, they can cause the pleural thickening condition.