I have the same truck as you (OP), with the WT package, and I routinely haul cars up to 4,000lbs plus trailer weight (so roughly 4,000 to 6,000lbs total). I have 22,000 miles on it in only a year and have zero complaints. BUT I will say that I hear what you're saying but it's only because you have so few miles. When the truck truly breaks in, it will get better. I remember mine doing the same thing until it got past the first oil change. Give it some time