There is no cure for PTSD. Meds can reduce the anxiety but, you need to be aware of your weaknesses and triggers and prepare ahead to have an action to take should the need arise.
Only you know what will make you comfortable. Possibly short trips closer to home. Make your RV your second home. Try to detour your preoccupation of possibly having an attack with a hobby (learn to play a guitar or paint scenery of your trip), listing to music can be a detourant.
What advice does your therapist suggest. Everyone is different.