Seems like a Peterbilt day - they were everywhere I looked.
The big black unnamed and unmanned Pete was sitting on Hollis Street, missing one half of its B-train trailer. Big mid-rise sleeper with pin stripes, and the 7" exhaust stacks -looks boss.
The pristine white Brennan Farms Pete was waiting for a load for Hartland, NB at the former Dover Mills (now P&H Milling) flour mill. It has a low rise sleeper and straight stacks,
I also like the Mac trailer (no relation.) http://www.mactrailer.com/
[P&H stands for Parrish & Heimbecker, Limited, which acquired the Dover Mill in early 2009, and have decided to post their own name on the flour mill.]
The third Pete was also a B-train and it tried to get in the KW photo - it would have been a worthy shot too.