If really considering a Trek, which as are a unique coach in many ways. Liveability of a larger coach, but in smaller length foot print, makes all the difference for many owners. (Either for where they store it, due to space restraints. Or where they camp style wise due to length restrictions.)
I personally would take the 8.1 gasser over the GM V8 diesel Trek's (or the 4 banger diesel). Lots of power, decent MPG, and much quieter than the diesel for driving.
You very seldom meet a Trek owner that is not happy with the rig. The only downside to our style of usage, is I'm up early in the AM with a cup of coffee and usually watch the sun come up over a fire outside. Then inside for AM surfing until the DW gets up usually between 7:30-8:00AM. The bed in the front living area, would not work well for us.
Best to all,
Roo II is our 04 Country Coach Allure 40'
OnDRoad for The JRNY! Enjoy life...