Walker Mountain is a Southern Oregon summit that could be a drive-up for those with a fully capable 4x4. However, the roughest part is also the start of a decent hike and getting to that rough spot is easy with a vehicle with decent clearance. Note that there is another Walker Mountain in Oregon - this is the one near Grants Pass.
Fielder Mountain is an easy 'road' summit in Southern Oregon. With several large RF sites at the top, the road is passable in a passenger car all the way to the summit - however a gate may put you on foot for the last portion.
Update February 2021 - Lost Dog Road is now gated with no motorized vehicles allowed. It's only a one mile road walk to the AZ.
This is a very much out of the way summit, along Highway 101 on the Oregon Coast, about 14 miles north of Bandon. Note that there are other Peak 740 in Oregon - make sure this one is your intended peak.
NOTE in January 2021 there was a NO TRESPASSING sign posted on the Stimson Gate Placard. See photo below.
There are FOUR Wildcat Mountains in Oregon, so be sure you want the North Coast version south of Highway 26. The road to the trailhead is short and easy in any passenger vehicle, there's a good spot to park, and summit is in the Tillamook Forest, although the shortest access crosses private timberland. The hike is about 1.5 miles one way, and 400 vertical feet gain. This description I consider the 'no bushwack' version.
A friend of mine wanted to try a new, never before activated summit to start off his SOTA career and bring me along as his guide. Doing some preliminary research, this looked very much like a summit that would be very difficult to impossible to reach. From Google Maps, it wasn't too far from the road to the summit, but checking Google Earth, I could see that it was really going to be a steep climb for the initial part of it and through what looks like dense forest. I wasn't expecting that we would be successful. Luckily, I was wrong.
UPDATE Dec 2022: There is now a closed (unsigned) gate a ways up Mills Bridge Road. It is recommended to park on the highway and this activation becomes an 8 mile RT. 2200 foot gain road walk.
I like big buttes, and I can not lie... 
I don't have much to add that K7NIT didn't already cover in her excellent report.
WW7D and I were in the area for the WA State QSO party (Salmon Run). This was the 2nd summit we did on this extremely wet Sunday in late Sept.
The road up to West Twin Butte is really fun... if you are on a motorcycle! The last 1/2 mile of this road is heavily rutted out, and would be a challenge for a high-clearence 4x4. Most people will probably opt to park lower down and walk up the road.
Today's attempted activation of Wilderness Peak W7W/KG-132 was my second attempt at my first SOTA activation. My cousin and I have been hiking all summer on various trails between Lake Washington and Snoqualmie Pass. In the last few weeks I've decided that I'd give SOTA a try. We made it up to the top of Wilderness Peak today where I was stymied by steady rain and radio problems. I called it a bust and will try again in a few weeks.
Browns Mountain, west of Sunriver, despite being pretty close to a paved road, was a tough bushwack for Roland-K7FOP and I, as we pursued several "shortcuts." So we recommend walking about 2.4 miles on forest roads, and a final steep ascent of about 1/10 mile. Total is about 900 feet of gain. If there's a better way to get to the AZ, please write up an updated trip report.