Since you are looking to renovate a trailer, it all depends on how much work you are willing to do yourself or pay to have done.
In general, trailers that require extensive work, especially to the frame, subfloor, and running gear can be had relatively cheap; those that only need cosmetic refreshes but are in otherwise good shape will command higher prices.
Your best option is to take advantage of forum members here who have experience in inspecting used trailers. If you go to the "portal" section of the website, on the right hand side you can input your state and the type of inspector you seek and see a list of people with such experience. There are many in Florida.
I have seen "field-find" vintage trailers that were little more than corroded shells be restored to stunning show-stoppers (after many years and lots of $$$ and hard work) so anything is possible, it all depends on the depth of your wallet and the willingness to do the hard work.
The forums are filled with threads of uncounted trailers and their owners in epic rebuilds, the challenges they faced, the solutions they implemented, and the proud results they achieved, along with sharing all their despair, pleas for help, and joyous triumphs (not to mention fascinating and informative pictures!). For virtually any scenarios you might face, it has probably been done before, several times in several different ways; everything you need to know, how to do it, why or why it may not be a good idea, the choices pro and con...all that is here.
But now a word of caution; the classified ads here are filled with aborted refurbishments; owners who started with the best of intentions, gutted their trailer, then decided they did not have the space, the expertise, the money, the time, whatever to finish. "Vintage trailer already gutted and ready for your dreams..."
Likewise, there are threads where the owners swear they only intended to fix a crack here, paint a little there, only to end up doing a complete "shell-off" restoration.