I live in Idaho and our campgrounds have been overflowing. One of the main reasons (my opinion) is that Oregon and Washington have shut down their campgrounds. Last time we camped in hells canyon we noticed a lot or OR and WA plates on vehicles. I can't blame them, we all need to get out. I plan on doing a little boon docking as my 351M is pretty much set up for it. No solar, but generator and 155gal water tank. I won't be able to take it down any 4-wheel drive trails, but there's lots of BLM and national forest here with roads we can maneuver. When traveling cross-country, I've stayed in truck stops, Walmart parking lots and rest areas. Just for one night, but it was very doable with the Genny.
Oregon shuts down most their CG every year at this time. Many are in the mtns where snow, freezing temps and lousy weather occur a lot.
St parks are open in most areas. County parks are iffy. RV parks are always open.
Most of Oregons FS type CG's are in the mtns and no usable after Nov 1st until May ish.