I think I might try the rope but instead of folding the cover first, I might leave it in a long snake with both sides and the top spread out. If that works, I won't need a ladder as the sides will already be hung where they need to be.
We put our cover on our E21C thus: Tie 3 light ropes abt 20' long to three tie down sites on BOTTOM passenger side of cover.
Tie a roll of tape or other soft light weight to the free end of each rope
Toss all 3 weights over trailer from driver side to passenger side
Pull each rope over. Which will bring cover up
and over top of trailer
One person on step ladder lifts Cover over AC unit and antennas w long pole while two ppl pull ropes and cover towards passenger side
Takes abt 10 minutes. Then toss tie down straps under trailer and pull tight ...abt 10 more minutes
We tried rolling cover from front but it was difficult. Our "up and over from driver side " is easier and fast. .
It’s best to have 2 people & 2 ladders. I like starting with the cover on the aft section of the trailer and rolling it out onto the tongue. Adjust so the door is accessible.
Then I do the opposite when taking off the cover. Fold the side panels so everything is on the roof. Roll from tongue aft. Have a large stuff bag for the cover. If you’re consistent, you’ll know where the door opening is located.
It’s a hassle, but I feel guilty when I delay putting the cover back on between trips. Even though I deoxidize & polish the trailer annually, I can see how the sun fades the decals.