I was really disappointed with Rain-X the first time I used it, it worked okay the first couple of rains but it lost its water shedding ability very fast. I tried it again years later, saturated a clean cloth and kept turning and wiping over and over until the cloth was dry, then re-applied it again the same way about a month later, and it lasted for a decade.

 

That's the secret for a long-lasting application. Start with a clean windshield, and apply at least two coats with plenty of time to dry in between. At least a few days. Although it may feel dry to the touch, it seems it doesn't really cure for several days. If you apply it in the morning, and then drive around in the rain all day, by the end of the day it will be pretty much gone. BTDT.

But give it a few days to dry before the rain hits, and it's a very different ballgame.

Then use the Rain-X windsheild washer fluid as your regular washer fluid, and you will be good to go.

I try to re-apply about once a year.

 

tires depend on the load you're hauling. if you are at or near max load on a regular basis you should be at recommended tire pressures. rears at 80psi, on the fronts 60 is recommended but I like them at 65psi and haven't had any issue with wear or driving in any weather conditions.

I don't know anything about Rain-Ex but I keep a bottle of Windex in the truck a couple rolls of paper towels and new wipers every 8 months or so. remember to clean the wiper blades when you clean the windshield. road oils and crap build up on them very easy and ruin their cleaning ability.

 

I'll have to check the exact type of wipers I bought, but I put a set of Rain-X wipers on my work van over TWO YEARS ago and they still work like new, no streaking or chattering.

 

I always run 80 PSI in my load range E tires.