There are campgrounds where campers haven't moved in 25+ years and you guys are okay with that? A lot of them have even built permanent structures attached to their trailers (which created havoc when trying to evacuate campers during this spring's flood).

That is akin to building a house on someone else's land without permission or a renter taking it upon themselves to take out walls in an apartment. The TVA owns the land. The campers are only subletting it.

Say you owned a beautiful piece of land and you leased it out to a farmer to grow crops on the tillable acreage. You drive by next spring and someone has placed a house smack in the middle of it because the farmer decided he would make a little extra money by renting that spot on your property to them for the next 25 years. Would you care? Maybe that's not exactly an apples to apples comarison but it's pretty close.