I've got the 298RES (2011) and we love it. The issue is...loaded...it's pretty heavy.
No water loaded...just general items for say a 2-3 week stay, it weighed in at just over 8100lbs. Fully loaded with water it would be pretty close to the max of 9200...
My tow vehicle for last summers season was a 2006 Chev 2500HD with the 6.0L gasser. No mods or anything...but wow...wasn't impressed at all (sorry to any GM/Chev guys...it's just was my experience).
Now, I'm not saying that I wanted to tow the TT at 70+MPH, but dang...took a bit to get it up to speed and it had trouble holding 65 without revin at 3000 (even in tow mode or 3rd).
In short...for the 6-8MPG it got and the overall power attempting to tow...I'm looking to upgrade BIG time
Even though it did the job...I'm currently looking for my cummins...
Tim (aka Workingchump...sigh)