I have a 1997 GMC Sierra Z-71 with a 350 V8. Two weeks ago I sold my 18' Fleetwood TT. At 4100 lbs. it was no problem to tow. We've settled on a Cherokee 27Q as our next travel trailer. It's 6200 lbs. dry. Do I have enough truck to pull this comfortably? The toughest terrain we'll travel will probably be the Smokies - in the Gatlinburg area.