Door Organizers

My apologies if there's a million threads on this. I tried searching for it, and wasn't coming up with anything.

I have a two-horse slant load and am looking for something to help organize my grooming supplies. There are various types of door organizer things ... some that are actually attached with hardware to the trailer door, some that hang over the trailer door, some that hang over the door, but you can take down and wrap up and have it be portable, some that have velcro attachments (?), etc. Do the ones that just hang on the door work well? I'm not nuts about screwing stuff to my trailer. What kind do you have? What do you like about it? What would you want to be different?

Thanks!