"The Cheap Comes Out Expensive" - Author unknown.
I second @John Fedro! Ask yourself "why is it free". Having managed a 1306 lot senior mobile community in Florida, I can tell you that all owners want is lot rent... what is on the lot tends to be an after thought. As soon as you take control of this home, you start paying lot rent (so much for free). If it is owned by one of the REITS in the area (ALL, ELS, HTA, CAL-AM, ETC), the manager is not in a position to live up to the promise of waiving lot rent (notice... didnt say they cant offer it... they just cant live up to the promise).
Replacing the floor is a pretty big job, depending on the manufacturer. Also, once you pull up the floor, you see the plumbing, frame, tie-downs, etc... which can uncover a whole new list of problems.
I would LOVE to get back into the MH business, flipping homes, but I have enough Florida Park knowledge to know that a deal too good to be real is just that (see line 1 of my post).
Feel free to shoot me a PM with the park and I may be able to provide you with some additional ammo if you decide to proceed. I have worked with well over 200 Senior parks across Florida over the past 10 years and have physically been in a heap load more than that.