Thinking about leveling

Bought a used 14 with lots of clicks....260000km(160k miles)
Dealer says they mostly install ready lift 3" front 1"rear, I'm thinking blisteins (5100) front due to the fact of the high miles and maybe an extra leaf with new shocks rear. Reason for the leaf(or possible shackle) is 75% of the time I have a cap on back with 300lbs of "stuff" in it.
I know the shocks would only give me around 1.5"s on the middle setting but with the cap on back, thinking it should sit level. Just don't want the nose to sit higher then the back.

 

Okay let me refrained this.
Pretty sure 5100's up front...or is there another none adjustable shock that will work in that price range and quality....1.5 to 2 inch lift?
Going to change shocks in the rear also, for the lift probably a leaf and buy some poly bushings....Shackle would be nice but a little to pricey for me currently.