We are on the same page. I do not own in The Gardens. I have driven through the development. At a macro level it looks well maintained, both the common areas and personal property. There is a club house. I do not know anything about the organized activities. There is no community swimming pool (I did not see one). If one likes the laid back atmosphere of a rural Tennessee community, this might be the place for you. All I could see were two bedroom two bath units. Most were joined by a common wall. There are some that were stand alone. It does get hot in Crossville, during the summer. Be careful when choosing. Some of the older houses have shorter RV garage doors. The newer houses all have garage doors that will fit the most luxurious motor coach.
As to other developments having an S&B + motor coach garage one needs to go to North Carolina or Georgia. The east side of the Smoky Mountains offers several choices at higher elevations (cooler summers). Consider:
Linville Land Harbor - Homes In North Carolina
This community offers a section for S&B homes with an attached motor coach garage.
Vista Ridge Homes - Cabins On The Blue Ridge Parkway
Similar in location to Linville Land Harbor.
In north Georgia there is:
Paradise Valley Campground, Georgia Mountains
I hope this helps.