If I purchase another battery to add to the trailer and connect the solar setup would I be in good shape? What would be my best plan?
One thing we all know is that you will better off than before. As others have mentioned, securing the modules on the roof or on the side of the rig will be much better than schlepping them around or worrying about breakage/theft. One big advantage to having solar with an RV is that the solar system does a brilliant job for battery health. The ongoing daily charge will put years onto your batteries.