I just checked the manual on the POD XT and the POD 2.0. They both have amp models for a Mesa Boogie Dual Rectifier and a Mesa Boogie Mark II.
I realize you wanted a Triple Rec model. Here's the cool thing about Line 6. If you go to
www.customtone.com (I think that's the site), you'll find zillions of downloadable patches that can go straight from you computer to the POD with a USB cable. They're all patches that users have created, and they're free. I can guarantee you (with somewhere between 112% and 143% confidence) that there's a Triple Rectifier model on there.