[20Piloteer07]

Doesn't look bad to me at all. I live in the frozen north where salting roads are common, and I wouldn't worry about anything you posted. But maybe someone will catch something I missed.

I'm not sure about that year, but the earlier Pilots sure had a spot prone to rot where the subframe is bolted to the rear axle carrier brace. I would be curious about what that looks like.

Maybe an undercoating would slow the rot. Something like woolwax, Fluid Film, NH undercoatings, etc.

 

[aggrex]

Most of the rusty areas in the pics could effectively be treated with FF, WW etc to slow or stop rust progression but one pic looks concerning which may be an overlap of metal as opposed to a crack. As mentioned another area to focus on is the unibody cross member that supports the rear subframe.

 

[enny]

Most of the rusty areas in the pics could effectively be treated with FF, WW etc to slow or stop rust progression but one pic looks concerning which may be an overlap of metal as opposed to a crack. As mentioned another area to focus on is the unibody cross member that supports the rear subframe. View attachment 157597

here is a comparison

 

[aggrex]

Ok looks like overlapped metal part of the unibody. Some preventative treatment should help to control those rusty areas. Be sure to inspect the rear unibody cross member where the rear subframe bolts onto.

 

[morfdq]

I’d be more worried about the lack of maintenance records than the rust. The rust (minor) would be the least of my concerns.