Today I installed a dual battery set-up, spark plugs, wires, and front rotors.
I have an airbag/on-board air set-up, which I installed about 1 yr ago now. I absolutely love the kit, but it's faulted out, blown fuses, and bogs down when the truck needs the juice too. Not sure why it took so long for me to do, but it's done. Starting up, voltage stays at 11.2-12.xx and the compressor sounds and runs much better/smoother under constant voltage. I ran it in-line to the main/starting battery, with no isolator. I've never run the compressor with the truck off, so should be all good.
Spark plugs (L8t gasser

) went smoothly. I'm at 65k of heavy/hard use. Idle was slightly rough lately, so figured it was time. Driver side is accessible from the top; if you don't mind getting fully under the hood and sprawling over the motor. Passenger side was a little more difficult, but considering I was doing rotors, I removed wheel/tire for more access. Partially removed the liner, then I was in. Passenger side done! Running smooth!
When I was installing them, I noticed something missing...2 stud bolts broken. The first and last studs. Doesn't appear to be leaking, but definitely something I am going to fix soon. I guess it's time for new headers...