When they first came out a lot of folks were happy because of the added stability they gave them. I know my wifes first thought after seeing them was - So isn't all the dirt/rain etc going to go inside the camper?
My first thought was that I would never be able to use them at the storage yard being in close proximity to the trailer next to me. I just figured if I ever bought a new trailer like that I would need to have them swapped out.