what is the best spots to ground down my system??? i got 2 amps and 4 12s

 

Ground both amps to the same point, wherever is closest to their location. Use a stainless steel bolt a little longer than you need, then on the bottom side run a ground wire from the bottom of the body/bolt to the frame of the truck. It's about as solid a ground as one can get IMO. Don't forget to do the BIG 3 and ground the battery to the frame as well.