I think so too!
I got the cross-bar that clamps on my bike made by Saris and it actually doesn't make it much easier - I still have to struggle to get one side of the bike on the rack because of that TT - there just isn't much room between the cross-bar and the TT.
What size is your Trek? I wonder if this is because mine is so small - it is the smallest 7.6 they make.