I love my 2008 LMM, no real problems. I also hated the 26 gal tank, and replaced it with a Titan 52 gal tank. Love the range now. I get 10.5 - 11 mpg hauling my Silverback.
With only 32,600 miles, I hope it lasts me many more years. I am looking to add a BD VVT brake for better braking. The tow/haul mode does a decent job, but I think the VVT will help.
It's regened a few times while towing, but for the most part I have no complaints about that. I did add stronger(wider) wheels and wider tires to increase my towing margin on the rear.
