Spectrum serves the Bushnell, Florida area, lots of RV parks around there. It's where I am spending the winter and probably the summer.
Maybe find out where Spectrum services and then find camps around there.
Best bet is find the RV park you want to stay at and ask the office if they know who provides internet in that area, then call the company and see if you can get a 90 day hookup or whatever.
I use Spectrum in Bushnell, no contract $49 a month for wifi modem. I use their modem rather than mine. Well, I don't own a modem at this point, at the time it just seemed easier to use theirs.