Tent camper graduates!

Hello all, I finally purchased my first travel trailer last week after tent camping for many years. It is a used 2023 T@g 5-wide Boondock. Since I don't have any maintenance records for it, it's in the shop now to have the wheel bearings packed and a 50 point inspection. I'm sure I'll have many questions as time goes on, and here's my first: The outside cover at the 30 amp shore power connection flies open while underway, how do I alter it to stay closed at 65 mph?