So many things influence bass. We had an aerostar van and the wife had a stereo put in with a 10 inch sub which they put behind the front seats. It impact was less than spectacular, by alot. I moved it to the back of the van and faced it toward the tailgate and it pounded like no other. Same effect when i built a 10" for my Ford Probe , it was a hatchback and facing the sub towards the back really made all the difference. You just dont know till you try different things. Corner loading is always a good place to start. Ihave never done the sub crawl but im sure it beats the hell outta lugging a 150lb sub around.

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