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The angle of the engine makes it easier for the pistons turn the crankshaft.
Yes, there are many websites that sell customized truck covers. See: http://www.truckcoversdirect.com/products/truck_covers/1/truck_cover/truck_custom_fit/?gclid=CKyoqq2i-KECFQ8MDQodV04zCw, http://www.empirecovers.com/truck-covers.aspx?gclid=CNa34b6i-KECFRA35wodyGkyGg, http://www.carscover.com/vehicleselect.asp?vtype=truck&gclid=CPjnnMyi-KECFQ_yDAodHza3FA for starters.
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