Indiana to Florida is not a short trip...
The facts are, not a whole lot of people are going to have advice or setup info to do what you're trying to do, because you're trying to use the truck way outside it's intended capabilities. The trailer's already too heavy, plus you have to add the weight of a 5th wheel hitch, and a sliding one at that (if it even fits or will clear the cab with the trailer in any position).
A few guys on the Tundra forums that I'm a part of (last truck was a Tundra, loved it) like to brag about how they can tow XX,XXX lbs with their 8 inch bracket lifted trucks on 37's and it "has no problems" with their fifth wheels or goose necks, but yet it somehow seems they're always the same people who are upset that their rear axle bearings are toast at 50,000 miles and can't possibly fathom it because they "bought a Toyota for reliability".
All I'm saying is, you had the opportunity to buy the appropriate truck (because you just bought a new Ram), but you didn't, and now you want others to give you advice on how to use it improperly... Just don't be one of those guys who's all pissed off because your "Fiat is a piece of ****" when something goes wrong from misusing it. Not saying you are that type, just saying, keep your expectations in check, yanno?