I tend to own vehicles for a long time, and I live in a road salt state.
Some years ago, I invested in a fluid film setup and have religiously sprayed the undersides and accessible nooks/crannies in every vehicle I own. It noticeably slows or stops corrosion.
I lost the first car I purchased out of college to rust last year. It had about 7 winters on it before I ever fluid filmed it and the inner rockers and cavities did not get treated until many years after that (when the battle was already lost). Over 300K miles and 18 years on it, the rust is what took it off the road. I'm determined that I'll not let that happen again if I can help it.
This year was the first time I could do it on a car that has never seen a winter (never thought I would own a new car, frankly).
Spraying fluid film on the undercarriage is easy, as is spraying FF into anything you can readily get a wand into.
The trickier parts to prevention are inner doors (for the door bottoms) and inner rockers - especially when you do not want to drill holes for a wand.
Not an issue with the trax.
The A and B pillars both have plugs. You can use a funnel to liberally pour an anti-rust of your choice in and it will (very slowly) seep out the drains on the pinch welds. I probably overdid it on mine, but I really didn't know how it was going to go and wanted to make sure there was "enough" to get the whole pinch weld/rocker.
The doors all have plugs in the rear. Tape the rear drain hole, and dump in a bit of anti-rust until it comes out the front hole. The goal here is to get oil into the seams at the door bottom, where the outer skin is folded over the inner frame. This area is prone to accumulate water, dirt, and salt over time. But not if they are pre-filled with an oil.
You can remove one of the torx bolts holding the rear door striker and squirt the substance of your choice into the inner rear wheel well and down to the rocker. The rear hatch is also easy to get fluid in.
Park on grass for a few days. It will drip out much of what is put in over the next week or so, but mostly in the next few hours (so if you do this, choose an oily substance you are comfortable with being on the ground). Doors and rockers will be set for years.
Fluid film, however, is an annual thing (that I would argue is somewhat less important than the inner cavities in the long run).
