Alright, we've got a '99 4x4 Burb with a 454 that is an awesome truck, but it can't pull our 26' Weekend Warrior for sh!t. It does good on flat or downhill, but if we hit a hill it slows way down. What is the best 4x4 tow vehilce (diesel I am assuming) for a family and needs lots of room? Is Chevy ever going to put a Duramax in a Burban?!?! Thanks for your opinions.