rockford fosgate box enclosure

[lion]

Need help with sub box. I have three 12" rockford fosgate T1 subs with rockford T30001 amp. It's going in a 2006 toyota tacoma access pickup truck. It has about 53" length, 20" height, and the width depends on how far up I move the seat so I don't know the exact size space for the width. I'm going to put the amp on the box facing the back seat. I mainly listen to hiphop/rap and wanna get deep bass and I'm trying to make a box but don't know what type of box or size to make. Can I get some help plese?