I have them on my 02 using factory switches. The are a few details
here. I get home later today and will post more details there. Long story short on a 99-02 truck you'll be pulling 8 new wires into each door. As you get newer with each feature you can drop a wire (turn signal, clearance, heat,etc) from the 8.
If you want the electric adjuster to work you've got to use the new switch and do some wiring there too since the up/down/left/right got all swapped sound in the later trucks.