What would you do preemptively to this Jeep for longevity?

I tend to packed all the electrical connectors with dielectric grease. Keeps the contacts from corroding and makes it somewhat weather proof.
 
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I also use some dielectric grease whenever I open a connector. Good call to point that out. For a more permanent rust preventer than Fluid Film you can use any of several brands of cosmoline. It lasts a lot longer between uses, is less wet. It doesn't apply as easy,but ask any military guy (or gal) and they can affirm just how great it is at combating corrosion 👍