The correct answer is take that pad and build a garage all around the RV
Now, we know that is not going to happen. No difference in FL than many others who have to endure very hot summers. RV's are built to withstand the weather. We are in the N GA mountains and (unlike this week) the sun shines and it is HOT in July/August/September. The main difference on what you park upon depends on the availabliity to you. We are on a 60 ft concrete pad. Other than spraying the outer perimeter and laying down ant repellant, NORMAL shut down procedures work well. There are many lists available in the forum through "search" that will take you there. I would say, COVER your tires with those tire cover doo dads....UV rays are harsh to tires and they do not have blockers like your roof materia. QUIT WORRYING, ENJOY YOUR RV.
How many thousands of RV's sit on lots unsold for extended periods?.. PLENTY
They generally do not melt or disintegrate...