Well Lets see first GET YOUR SELF A BOOK ABOUT CAR's and learn what the **** you are talkin about, Ok now here we go.
For the sound system i would go with this stuff:
Sub's, Shallow:
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I would get a 2,000 watt amp and turn it down Just for the reason they can hit 800 watts max, and then u can always upgrade
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Also Upgrade your alternator and get 2 batteries and dont waste your money on a cap the 2 bat's and the bigger alt will wake make up for them subs.
And for your tv set up I would Say get this.
Computer for your car
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I would go with the monitor
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Also i would Upgrade from that stock POS alarm, And if it was my truck i would get a lift kit, But you need know how to do it, i have a 8 inch lift on my truck. You also could add L.E.D's For night time driving, INSIDE not outside you will get pulled over alot. You can set them up to turn on when you open your car door's or even when your subs hit in the car,
Just what i would do if it was my truck.