We have stayed at the Waco Airport Park two times this year. It is a first rate place to stay. Many good sites. We used 50 amp, but I think there were also 30 amp connections. At any rate, it would be a good idea to have the adapter as others before have suggested.
It WOULD BE a big deal not to have air conditioning in Texas in the Summer, that's for sure. In fact, we use both of our ACs to cool down the trailer on Texas afternoons after traveling. We have never had to run them both at night, but have definitely needed them in the daytime.
I know the park at Waco pretty well. If you have any questions I'll try to be of help.
