So I've been searching for an 06-09 Limited/Sport with a V8 and 4x4 with low miles. It's been a tough search because I really want a black one. I found an 06 Limited that has everything I want with 40k mi and one owner, but it does not have the X-REAS suspension. My question is how much does the X-REAS assist with towing? I will be towing a large boat (about 5000lbs including the trailer) quite a bit and trying to decide if I should find one with the X-REAS suspension. Thanks in advance!