I have a Sony Xplod 12 inch sub with box for sale it's a older model but just took it out of my old F350. Doesn't fit under the seat or behind I had it in between the front and rear seats. I also have 2 same model Sony Xplods in a large car type box. They show a little wear and tear but don't miss a beat. Sub boxes/enclosures are free with sub if wanted if not there just being trashed. Subs $50. Each Buyer pays for shipping. This is the pic in the single box. Don't have pics of the double yet
move your seat forward...my buddy has 2 solo barics behind his seat and its the same truck as you cept with a 7.3
I don't think my seat moves forward that I know of and if it does I really have no room to move it forward I have 2 car seats back there hahaha