Your post indicates that you are aware that proper tire pressures are related to axle loading (actually the weight on the heaviest side of each axle).
There should be a sticker somewhere that indicates the recommended tire pressure for each axle. These pressures are based on the max weight capacity of each axle. For our Class C, the sticker says 65psi front and 80psi rear. Our tires are rated for 80psi max.
We got our RV weighed at a scrap metal recycling place and were able to get individual weights for each side of each axle. Based on these weights, we run 60psi front and 75psi rear.
There must be recycling places in Florida that could weigh your RV.