This is an old thread but just remember that, so far, there is no bureau of standards for this stuff so you can only count on personal experience with a treemaker. You (I mean they) can call them anything they decide to. It will be helpful in understanding the dynamics to get individual bars (not trees) and set them on horses to really see things like angle, rocker, flare, etc. That will also help you see the value of and places for rounded edges. Progress with pads has made it easier. Get several pads to extend the useful range of a saddle but remember that the best and most stable result comes from the least amount of pad necessary to make a good even match for weight bearing (horse) and weight distributing (Saddle) surfaces