I'm on my second Jeep Grand Cherokee. My first one was a 99 with the 4.7 V8 and that did a decent job towing, but I just bought a 2005 with the 5.7 Hemi and it's got plenty of power to spare. I hardly even know my boat is on there, other than slowing down. Take that part with a grain of salt at the moment though, because when I bought it I knew the brakes were just about done. I'll be replacing them tonight after work, so I'm expecting to see a pretty good improvement there as well.