Should I rust proof my truck?

Hi all,

I live in Ontario, Canada. I have a 2021 F-150 that I got a few months ago, used now with 90,000 km (55,000 miles) on it. The previous owner judging by how it looks didn’t rust proof it. Surface rust on the frame and other underneath areas (nothing body wise) from what I can tell. I plan on keeping it for a 4-5 years. Will it be worth it to rust proof it now?

Thanks for the input!