hmm... you may have to be a bit flexible with your desires. if you want any kind of decently sized sub and a box that contains a volume within the sub's optimal range (which can make or break a system) and you want it to only take up one side in the back of the cab, you can probably make one and situate it so you dont have to remove a jump seat.
whether or not you will be able to flip the seat down and use it... that's a different story.
pretty much wut Kristoffer said. you could always do measurements to make it fit under the jump seat when it is down but that may not sound the best. or you could make it right and have no use of that side of the back seat.
Can i have the dimensions for that one right there. It is funny because that is like what i wanted. I saw it the other day whaen i was on here and when i couldnt find it i made this tread hoping to find it.