To answer the question posted.
The parks while open to the public are mostly tailored to the paying members. Encore is a bit different from the Thousand Trails parks in that you are assigned a spot BUT they also have more seasonal/ yearly rentals. The TT parks are mostly all first come first served spots and have less seasonal and are more tailored to transient travelers.
The TT parks do tend to be off the beaten path but not all wooded as described above (maybe you're in the PNW more than anyplace else - there they are). I'm currently in the Orlando TT location which has some shaded spots but for the most part you're out in the open. We've visited most of the states that have parks and have found that it really depends on where you go for the openess of the sites.
As for out of the way besides the park in Las Vegas this one seems to be the closest to civilization we've stayed in. The TT parks are called "preserves" not resorts and some do pride themselves in being out there (one park we stayed in was 70 miles outside of Seattle which by no means is close to me). The Encore parks are a bit closer to "town" if that's what you are looking for and do have some nicer amenities. We were at a beautiful park in Mesa, AZ that I'm sure most would call a "resort".
We're not long term campers so I can't say what the rates are for that and we have a TT membership with the added Trails Collection giving us a selection of Encore parks we can visit. Rumor has it that they're working to curb the long-term camping (raising rates). I've been to some parks where it appears that the manager has just let people do as they wish with the sites (and they looked like 3rd world countries). Those we will never return to. The long term people do give an influx of funds that the transient travelers don't provide. We pay our dues and basically camp without more out of pocket.
Thousand Trails memberships aren't for everyone (you will see that as people answer) but for us it's been invaluable. We've been able to be on the road for the last 1.5 years while I work and we maintain a home in St. Pete, FL. by staying at the parks with little to no additional $ out of pocket (they're not everywhere). We purchased a "used" resale membership so our out of pocket is low for what we get in my opinion.
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Thom and Diane Boles
2010 Winnebago Vista 32K