Need advice on sub sound quality
 

Im thinking bout adding a car stereo to my camper. I want to run a head unit with 4 6 1/2s ruoff the head units power inside and run two amps to 4 6 1/2s in a box and a 12 inch sub outside. My question is if I mounted the sub in a downfiring vented bandpass underneath the camper would I get decent sounding bass

Aside from it being outdoors which will kill the intensity, it should potentially be fine.