Yes, I've thought about having a clear plastic/vinyl top fabricated locally, even talked to a couple of folks about it but have never gotten past the is it possible to ? and what would a ballpark figure be to make one? initial question phase. Since I mainly use it for dust-free storage when at home I never pursued the matter further. Occasionally I'll load it up with everything but the stands and take it with me when I drive to out-of-town shows but the CAR-2 sits in the hotel room and only the rig I take to the show (all of which have their own smaller bags) makes it to the venue.
CAR-2 with a collapsible cart may be just what the OP needs.