treeless saddle

["guest@endurance.net" <guest@endurance.net>]

Jan saffronblue@breathemail.net
I am looking for a treeless saddle but am located in Scotland which is causing a few problems!!  The Tuend saddles are available over here but I dont know anybody who has one. I have a shortbacked wide-ish pony who has a forward girth groove.  This causes his skin to "wrinkle" slightly when his shoulder moves back under the saddle. Does anyone have any idea whether the treeless saddles (particularly Tuend) are suitable for this type of shoulder.  I know its very difficult when you cant see the pony/saddle but I am keen to gather as much info as possible before I do anything else.  

Thank you