How have your trailers held up camping in the mountains?

ReferDog wrote:
Interstates worst than back rds. I-90 over the Cascades will though most stuff on the floor, worst than I-5 though the SJ valley

:h

I use I-90 a lot, and find it to be very well maintained. Certainly the section near the summit that they're working on right now is a bit rough, but in my mind that's to be expected during construction.

That said:
If you prefer Forest Service roads to I-90, there's an avoid-the-construction bypass that's right up your alley: just get off I-90 at Hyak and take FS 4832.
Full description/directions at this link

Have fun!