is the sub DVC 4 ohm, or DVC 2 ohm? DVC 1 ohm? DVC 3ohm? 8 ohm? (dvc 4 ohm is most common btw)
is it a mono amp?
if its a stereo amp, is that 2ohms that it says it will handle bridged, or in stereo?
99.9% of the time, facing the subwoofer towards the rear of the car will get you the most bass in the cabin, but it should be easy enough to install everything, then spin it around and move it in the truck to see how it sounds best to YOU.