Originally Posted by WrenZ71
You will be fine,see my signature my trailer is larger than yours.
2007.5 up 3.73 were only available in the 1500's with the 6.0l vortec max or 6.2L max trailering package.
That is correct through '13 for the GMT-900.
Starting with the new '14 truck (K2000 or whatever it is called), the 1500's were/are available with the 5.3 and max tow package which include the 3.73 gears. With the 6.2 now having the 8spd trans the max tow includes 3.42 gears if I remember correctly.