What is the name of the C.G.?
We stay at Singing Hills just outside Mammoth Cave on our way down south and on the return. It is a Passport America park, friendly hosts, nice long drive thru sites and is open all year. It works fine for us for overnight. Would also stay a couple of days if needed to but we always use our own washroom. Theirs leave a bit to be desired, unless they have been updated recently - I haven't taken the time to look the last 3 years we have been there.
Encore and Thousand Trails programs are only good if the parks are in a location that suits you and you make a point of using the program.
Do the math before signing on the dotted line - and read the fine print.