I still would like to pick one of these up because I do have the need for different sizes often and I just carry 3 complete receivers around with me all the time. This one will eliminate that.
Ends all the problems if you tend to haul different types of trailers.
I like this one better than the drop down type which IMHO gives 4 more moving parts to slop around and break. This one is one piece rigid. Just turn the whole receiver.
http://www.uhaul.com/MovingSupplies/Hitch-balls-mounts/Ball-mounts/Multiple-Ball-Mount?id=6914
