The Peterbilt 387 is the only one I ever really could get comfortable in. The rest are too narrow.
The 379 that all the "Big Riggers" like can KMA as far as I'm concerned...don't like scrape'n my knee/thigh on the gear shift as I'm ducking to dive into the stupid sleeper. But I guess there's something to be said about being able to crank the passenger window down while sitting in the drivers seat. (roll eyes)