Like any other class of housing, these require research and specific knowledge to make them work for you. The difference between Mobile Homes (on wheels) and Manufactured Homes (no wheels when completed) is critical.
@Jason Wray nailed it about rented lots vs owned lots. Also, beware of communities with a "buy in" or similar. That can be many thousands of dollars for the mere privilege of owning a property in the community. The largest I've seen was $40k, which was included in the $60k sales price.
Beyond that, it's still a viable class to pursue. The attraction is a lower price point for entry, while maintaining something close to a market rent. You can fix & flip for cheaper, BRRR, almost anything you can do with SFH you can do with Manufactured Homes.
They are simple builds and easier to maintain. But their failure points will happen earlier, and more often.
Insurance is a huge issue regardless, especially in Florida. Financing will be much tougher.
And you need to understand the local risks too. Some areas are prone to sinkholes. If there's freshwater bigger than a puddle, there will be gators to contend with (totally not joking). Tourism areas don't want to see Manufactured Homes and will actively fight you. Permitting and zoning will be huge issues. If you're looking to buy in a certain locale, do some digging and pick up the phone. Make sure the municipality doesn't pull a sneaky and require the home to be moved on transfer of ownership.
But if you can figure out the entry money, I think there is plenty of meat on those bones.
I would definitely start with a seller-financing approach and build up from there.
But it's also very scalable. You could develop a parcel, move new construction homes in, and sell them, lot or not, for a very nice profit.