Titan owner: My frame and suspension is starting to show its age on my 06. Has anyone found any success with grinding/ surface rust converters and paint? Want to try to slow down the issues I’m starting to see!

Intelligent Tinkering: I spray POR15 on all my vehicles, refreshing once a year. Then sometimes I add Fluid Film on top of that too. I have an outdoor lift, which makes it easier. You can pressure wash the underside thoroughly beforehand. If you dilute POR 15 heavily with Zylene about 50-50 or 60-40 (experiment beforehand) it sprays well from a pneumatic sprayer. A gallon will do several vehicles. You have to be ready to clean the pot quickly (Zylene again) or it sets up in no time at all, especially on a humid day in summer. I use a dedicated gravity feed HPLV pot, a cheap one, and stand ready to toss it after only four or five uses. It's cheaper than a new truck. And you need to suit up and wear a decent respirator and goggles. The stuff is very toxic, and it sets up with humidity so just a tiny droplet in your eye or lung becomes a small rock. In general it can save the outside of your frame for many years more service, even here in Maine, but my Titan is rotting from the inside out too, so it's not a perfect answer. A heavier truck, like a big GMC, would last longer because the metal is thicker. Fluid film is just "belt and suspenders" too. There are guys around here that specialize in these coatings, so you wouldn't need to do it yourself if there are some wherever you are.