Strait Tree -
Ok, take a look at the Wintec's - their trees are very strait. From Pommel to Cantle, there is no arch at all in the tree, just strait as a board. That is why Wintecs work very well with flat backed horses, not horses who have an arch to their backs, like TB's for example.
If you look at the panels, look directly under the cantle....and follow the line to the Pommel - see how strait that tree is. You don't want that for a horse that has an arch to their back.
The Bates as well - it is understandable that the tree's are the same in both brands of saddles, since Bates makes Wintecs as well.
See how strait that tree is. Follow the panels - no curve to them at all.
HORRIBLE tree shape on these saddles for horses with saped backs. These tree's will bridge - just as what my Wintec 500 did to Nelson.
Now look at this Rembrandt Dressage Saddle - see how the tree archs. Look at the panels...see how it has more of a banana shape to it?
That shape of tree, accomodates horses with arched backs - like Nelson.
Same with this Stubben Siegfried VSS:
See how the panels are shaped like a banana? That means that the sadde has an arched tree.
Does that help? Your saddle, has a strait tree.