I wanna level my truck, but I don't know where to start!

[Telecasterjoey]

Hey everyone! I just finished getting all my trim on the truck I think it adds a lot of character. truck looked pretty plain before. I thought the truck sat ok but after looking at it today I've gotta level it. I have a pic of it sitting at home depot filled with drywall and it sits awesome. How would I achieve this look safely?

I need some help here this is not my specialty lol I know people say once you lower it you'll wanna go lower but I'd really like to just level it I use my truck for working and the roads here are terrible.
Ps dont mind the girlfriend making kissy faces lol just wanted to show how much weight it took to make the truck look right. Also the ground in the fist pic slopes towards the front of the truck making the rear end look even higher.