im plan on placing my amp in the trunk. im not quiet sure to make an amp rack to hold it vertical or to make one and let it sit on the floor horizontal. I was also wondering which spot in the truck is most convient when i want to run a short ground wire(and where should i place the ground in a 4th gen. max)

 

Mount it to the back of the seat back, with a carpeted mdf board.

 

I put mine on the floor behind the rear seat. Putting them on the back seat as Parag mentioned would give you more useable trunk space.

 

where did u place ur ground?

 

I was lazy and just used the seat belt bolt. I did sand down the whole area so that the ground would make good contact.