I really have no opinion on what you should do, here. But here's some brainstorming thoughts:
John Fedro has a lot of youtube videos, too. If you reach out to him, he will email back. At least in the past, he has. I believe he has even done deals in florida, so that's pretty cool.
Around here to move a singlewide is around 3k, and double, 4k, to move them 25 miles or less. (including tear down/set up) More the farther it is away. That was a while back, so add in for inflation, and maybe deduct some if prevailing wages are less in Florida, than here in WA state. I'm sure you can call around for estimates, of course. They are usually investors themselves, so there's some people to add to your list of connections!
This doesn't include foundation, skirting, hookups, well, septic, etc, as you know. There's a lot to think about. When we did this, it was a small part-time job for me to "manage" all the contractors, and make sure everything went on time, but I loved it!
Good job! Keep it up! I love mobiles, and they are cash cows, but there's no good way to borrow to get your money, (or in this case jeep) back out, except by selling, of course, and over time, the land value will probably go up, or even the house and land value.
If you sell just the land on payments rather than for cash, you could potentially get a nice down and a totally retail price, one payment at a time, which also locks up your money, unless you sell the note. So if you want to sell the note, make sure you research that so that you make it a note someone wants to buy. If you kept the note, and if they stop paying, you get the land back and get to sell all over again. Maybe you've already thought of this, but I thought I'd mention it. :-) I've not done notes before, but they seem like a good thing in their own right. Just brainstormin'!
Also, was the county specific on what type of mobiles were allowed? sometimes there's stipulations about age and size, single or doublewide, etc.
Stupid add on. If you decide to move a mobile, make sure you know exactly where the spigots are, and your concrete guy(if you need concrete) doesn't put the crawl space entrance immediately below it. lol. There's always something to learn! Keep us posted on what you decide to do.