I have stored our TT outside (ADCO covered) for 3 years (tampa) I had to throw out my first cover just last month, just buy a new cover and get another 3 years. TT looks brand new. We camp all holiday weekends, and usually will camp on either coast during the summer as the breeze does make a difference (especially at night). Since we starting RV'ing 4 years ago, we have really appreciated the living in Florida and the ability to camp all year long. Many florida parks have great tree cover, if they don't, you will be uncomfortable. The sun gets everything very hot and fast!
You will not see anything cheaper than $30 per month, that is what we paid up in zephyrhills, we now pay $55 closer to our home. Your camping frequency is up to you, sure it is hot and humid in the summer, our a/c runs during our winter florida trips, that is just florida camping.
From Lakeland, you can get to both coasts in less than 2.5 hours. We are a young, busy family, and florida camping is fast, easy and enjoyable. Come on down and enjoy the florida lifestyle