I wonder if some of you guys have a trailer to tow all of that stuff.
You must have much more inclement weather than we do here in SE MI.
GM recommends die electric grease for weather seals. It comes in a small tube for cheap, just make sure you buff off the excess.
I use RainX. It affords me to need the windshield wipers very little. I drive ~25K per year and use less than one gallon of washer fluid per year.
I have been driving these cars for ten years and never had to replace one set of wiper blades. Just make sure those little rubber blocks are in place that hold the wiper arm off of the lower windshield trim.
Another thing I do is wrap my front end for winter with some stuff I got at Auveco called Weatherseal Wrap.
It keeps all of that salt and crap from annihilating your entire front end and engine bay.
It works awesome. I have had it in place up to 75 degrees and the car did not run hot.
It peels off with no residue: Unless you leave it on for like three months without reapplying it.