Is it the main door that is causing the issue or the screen door? On my '78 Minuet, the screen door was causing interference that resulted in difficulty in closing easily. Replacing the nylon bushings in the screen door hinge as well as the lubricating the spring loaded latching mechanism on the screen door helped tremendously. I also had some minor deformation in the door that wasn't entirely apparent until the screen door was repaired (it had evidently either blown open in transit or been caught by a gust of wind while parked) a few adjustments from my Airstream dealer solved the entire problem very quickly.
Kevin D. Allen
WBCCI (Lifetime Member)/VAC/Free Wheelers #6359
1964 Overlander International/1999 GMC K2500 Suburban (7400 VORTEC/4.11 Differentials)
1978 Argosy Minuet 6.0 Metre/1975 Cadillac Eldorado Convertible (8.2 Liter V8/2.70 Final Drive)