2007 Chevrolet Silverado 1500 LT2 4dr Extended Cab 6.5 ft. SB (5.3L 8cyl 4A)
We bought it new planning to occasionally tow our travel trailer. We have the 6.0L engine, 4WD Z71 package, locking diff, towing pkg. We have gotten up to 21 mpg on the high plains and some mountains at posted speed limits. We have the 3.73 rear axle, but should have gotten the 4.10 for towing our 5800# trailer, especially in the mountains. Only disappointment is the mpg towing; usually 8 to 9.5 mpg. The 6-speed tranny would have helped in the mountains but wasn't available in '07.
I'd buy another one in a heartbeat and the only thing I'd change is glint to 4.10 gears. Locking diff is great for offroad handling.
Making the 6-speed tranny available for towing, a little stiffer rear suspension for handling with a large trailer.