Looking for ideas on how to Roll up/store 50 amp cord

I have a 75' 6/4 cord that I use for driveway camping at a friends waterfront property. I understand the flexible cords work well. However I seldom need more than 25'. Maybe once a year I need a cord longer than 25' when camping at campgrounds.
Dealing with 40' everytime takes too much effort,especially when 25'will do.
For the record I have been known to wine and complain when I need to get out my 50 amp extension cord!