I pull my 18ft bass boat with a Jeep Grand Cher., and I use to pull it with a truck, so I know what you are talking about (big difference in the pull and sound). I really think it's because in a truck the back axle is outside and you don't hear anything, but when your in a Trailblazer or Jeep the back axle is just behind the back seat, so you hear and feel everything. That's what I chalked it up to, but I don't have any science behind my theory. It does suck the gas, I know that.
Ask me about: Bobby Garland, CrappiePro, Yeti Coolers, Power-Pole, and Simms Products!