Hi Lee, we are now at 7 Oaks RV park in Mission. We were here last year and like it. I guess you have to stay around here and check out a bunch of other parks to decide what you like. Some have large sites and some small sites. Some near the highway and some away from it. Some parks are $350/mo and some are $500+/mo. All plus electricity.
From here we are going a little west to Falcon State Park for about a week. A nice out of the way place. We like the peace and quiet, but it's not for everyone. There are no restaurants or stores near by and if you don't have satellite, the only TV stations will be from Mexico. Rosetta Stone might come in handy here.
Then we head up to Kerrville for the RV.Net Sweetheart Rally in February for a week or so.
Our final month will be in Aransas Pass for a month. Last year we were in Rockport but didn't like the park.
You are right about a lot of Heartlanders around here. There are four Bighorns and two Landmarks at this park now with another Bighorn coming in next week.
Early in the season it will be warmer in Mission than it will be up in Aransas Pass.
Good luck on what ever you decide.
Peace
Dave