I think you would get a different result if you sampled I-95 or I-75 at the Florida-Georgia line between December 26th and January 15th.
Different people travael in different RVs in different places at diifferent times.
Where I live, Friday evenings May through August it is mostly TTs going north on US-75 toward the lake, Sunday afternoon the same rigs coming back. All Oklahoma and Texas plates. Sit on the same highway on a weekday in later autumn, it is mostly fivers and class A, plates out of Minnesota, Wisconsin, Nebraska, Iowa, the Dakotas, same highway serves as the migration route toward the Rio Grande Valley.
People from other places, or going to different snowbird destinations, are on different highways, but in snowbird rigs, mostly A and fiver.
Where I camp, not a RV park, TTs and tents outnumber other types of camping rigs, but you can't count tents on the highway.