Your floor will probably be fine. Remember to load the heavy things forward of the trailer tires. Also be aware that your brakes are stronger than your accelerator. So make sure that things can't slide forward too much under braking.
Also you will need a trailer brake controller like a Prodigy P2 to control the trailer brakes.
LinkIf you have not yet purchased the trailer go through it with a fine toothed comb looking in all the corners and cabinets for water staining. Also look for soft spots on the floor and under the carpet. A water leak can be the death of a perfectly good looking RV.