6000# is about twice the weight of our family's 21' Shasta trailer when I was growing up. And we had 6 people in it, don't ask me how.That's gross for both trucks. 0.7mile/kwh for the lightning and 8.9 mpg for the 6.2L Sierra are both unimpressive, and those trailers aren't that big, 6000lbs isn't very heavy for a travel trailer.