The following is a list I'll have with me for a place to stay. Each of these have a website, some better than others. Old Stone Fort has pics of each site with sizes, just click on the site number and they'll show up.
Singing Hills RV Park (Cave City area not sure of the town)
(270) 773-3789
$30 - 30 amp website price
Exit 53 on I-65 in KY - 2 1/2 miles West on the right.
Country Side, Lebanon, TN
(615) 449-5527
$30-35 range price est from 2011 info
Near Hwy 109 & I-40
We've stayed here. Near the interstate and nosiy
(This is just east of Hwy 109 a cut off I use to avoid Nashville. I use Hwy 25 Exit 112 in TN to Hwy 109 then to 840 and onto I-24 just west of Murfreesboro.
Whispering Oaks, Manchester, TN
(931) 728-0225
$25-30 range price est from 2011 info
Old Stone Fort, Manchester, TN
(931) 723-5073
$20 website price
Marion County, Jasper, TN
(423) 942-6653
Office closes at 6pm Central time
$15 for Seniors website price
We have stayed here. Located just north of the west bound rest area at Nick-a-jack Lake on I-24
I haven't planned on anything down the line as we'll spend a few days in Atlanta area at in-laws then a one day drive to our FL destination. Hope this helps, have a safe trip.