Another Clearwater Florida girl here!
And yes, never went to the beach when I lived there but now that I live in the land of grey and damp, I spend as much time on the beach as possible when I visit. I didn't realise I lived in paradise when I lived in Florida!
Yes, owning the caravan will tick the box for having adequate accommodation.
The harder obstacle is the financial requirement for the visa. You'll need either £18,600 a year in pension income or savings of £62,500. And the fees for the visas are a very real obstacle. Be prepared to pay a minimum of £10,000 in fees over the next 5 years.