We have wintered in central Florida and a couple of winters in Texas for the past 17 years. Most sites were gravel or grass with a concrete patio. There are fire ants and other creatures but we never had a problem with them inside the RV.
You did have to be careful, if you sat outside for any length of time in the grass area, for the fire ants. The no-seeums are also a problem at times also outside. None were ever a problem inside though.
Enjoy your winter! Bring along a good wide brimmed hat, some sunscreen, and a good pair of sunglasses. :)
Barney