FYI, I am happy with my 2002 Envoy pulling the 3326. It has a 6 cyl rated at 250 hp, probably at a very high RPM. It has a flat torque curve over RPM. I can pull 6 or 7% grades at 50 MPH, about 2900 RPM in second gear. My rear ratio is 3.7 and that is my biggest concern about your rig. You are geared for highway milage and your performance won't be so good in the mountains. My towing capacity is rated 5600# and I think you will be maxed out with the bigger TMs. Your towing capacity rating includes all options on the TM, water, propane, clothing, food, people and all the contents of your TV/TM.
I recommend the 4WD option on a new vehicle for its granny gear that lets me idle into off-road boondock camping sites around trees or other obstructions and wouldn't want to be without that. It is also manditory for sand or cinders or other not-so-good surfaces.
I am sure you will get some excellent answers off this forum, so I'll keep mine short.
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