I love my Michellen Hydro-Edge tires. Great in any weather. Excellent ride too. They were a bit pricey although I think they were worth it.

As for other tips I can't think of any as I have only owned an SD but one thing I didn't like on mine when I got it was the power seat connections were soldered(sp?) to the terminals. They didnt work right so I changed them out to the newer style. Worked great. I have wiring diagrams since there are more wires on the newer ones than the on the old ones. PM me if you ever decide to do this. It makes it a lot easier.

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1981 300 SD 213k miles "Stock for now"
1999 Super Duty 7.3L 113k miles
1981 300 SD 180k miles "Heavily modified" SOLD