It's a tough one for you if you can't go first and see what it looks like. Regarding renting trailers. IMHO no matter how clean it might be when you look at it. It still has carpet and a lot of cushion type furniture, couch, dinette, etc. that all the cleaning will not take out the inevitable stink. And in Florida there are the roaches to think about.
From what I have seen stopping over at CG's that had rentals I have never seen them spray after the people leave. All I have seen them do is a quick vacuum.
That is why I suggested the cabin rentals at KOA. I was forced to layover at the TN KOA on the way down south for repairs for a week and I chose to stay at the CG in one of their cabins waiting for my MH to be repaired.
There's no carpet and minimal cushion type furniture and they were spotless. When my MH was delivered after repairs I watched how thoroughly they cleaned each cabin after each camper. I was impressed.
IMHO I would look for CG cabins. In Florida most are made of block.
I also stayed at a CG in Tavares, FL and took a walk one day and looked around at their rental cabins. They were REAL nice and spotless. Come to find out that instead of traveling in my MH and paying for CG sites.....I could have been renting these cabins for FAR LESS! :B