Why not rent a villa for the week and sell out the rooms ?
We come across to Sun n Fun most years from the UK. I rent a 4 bed villa around Kissimmee or Haines City - costs about $800 - $1100 per week. Now that will sleep 8 or 10 people - that's a max of $137 for the week each person !
For that you get a comfortable house, pool, laundry (guess you need a woman to run that), equipped kitchen and above all, the ability to meet other RVers, tell lies and tall stories and drink beer
Us Brits are hopefully having a meet at the end of the food tent closest to the beer vendor on Thursday around 4 p.m. If anyone wants to come along - feel free.