gate width in fence for parking/turn



So, I have purchased a new home, and I need to address the turn around/ parking issue. There is currently a fence that needs to be replaced, with a fence with a gate I can pull through, or back into, to park my Airstream. How wide would you make a gate to go through with a trailer? I want PVC fence for the no maintenance BUT the installer says 10 foot max ( 2 5 foot gates) or a 12 foot gate(2 6 foot gates) with metal frame ($$$) what do you all think?