Cut down RV Doors for road side (US)

I would like to cut down an RV door for my teardrop. I will have doors on both curbside and road side. RV doors are set up for the curbside and I see no problem.
I have not found any roadside doors. Ideas on what to do about the roadside?
I have not found any roadside doors. Ideas on what to do about the roadside?