The rear is not saging. It's an illusion in the picture. The driveway is slightly up hill. I went with a spacer kit, and reused OEM shocks, but wish I would have went Bilstein but maybe later.

Very few tools to put a stereo in the truck especially if you use the OEM wires for the speaker. Just lots of plastic clips. Pretty much a standard and phillips screwdrivers and a 10 mm socket.