Interested in this as well. I wasn't able to find any AT with the right width when I needed new tires.
I ended up in Premier LTX for rain performance, but I have to say I've put a decent number of gnarly forest miles on them and only needed 4x4 once.
Choosing the right axe is easy. This forest service publication covers the basics pretty well.
https://www.pcta.org/wp-content/uploads/2012/11/an_ax_to_grind.pdf
The NF motor vehicle use maps are a good starting place to find a spot. The roads you can officially camp on are marked. There's a ton of area.
https://www.fs.usda.gov/detail/ochoco/maps-pubs/?cid=stelprd3807233
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I'm planning to head into the Ochoco from Portland, if the fire danger isn't bad.
I'm still hunting a backup. I'm definitely curious to hear about other spots within a few hours from I-5. I poked around a bit in the Siuslaw under the path but didn't find many options for dispersed camping that...