Not to sound like too much of a smart a$$ but there are several things available to use. Most Auto Window Tinting shops carry window films from hardly noticeable to almost total black out, There are many variations of the Velcro attached curtain. During storage I use the mylar covered bubble wrap(Reflectix) cut close enough that friction keeps it in place. Most RV's have screen doors so exterior shades can be used.
Personally I find the standard old roll up shade works fine. Ours is attached to the sidewall above the aluminum door frame and YES after we close it at night, we have to retract it and when we're back inside, lower it. Not too big an inconvenience for once or twice an evening. The only time we use the shade is at night, during the day, there are things this old snoop likes seeing so the window is uncovered.
Carefree makes several shades, from total block out to mild, manual to motorized, AutoMotion Shade too. I couldn't see any specifically for entry doors.
There is a company that makes high end shades for MoHos. Several makes have them as standard equipment, I'm sure they have been approached with this situation and have an answer.
"I travel not to go anywhere, but to go. I travel for travel's sake. The great affair is to go". R. L. Stevenson
David Bishop
2002 Winnebago Adventurer 32V
2009 GMC Canyon
Roadmaster 5000
BrakeBuddy Classic II