Towing with Tahoe, Escalade, or Denali ?

Are any of you here towing your boat with any of the previously mentioned? Tahoe (5.3L only apply), Denali, or Escalade?

I have an 07 22SSV that isn't going away and I'm replacing my tow rig with something more "practical". My previous rig was a 5.3L crew cab 1/2 ton but it was lifted so I dont feel that it is a good comparison factor for these models.

Can you give me an idea of fuel mileage and weight distribution? How does your 2wd work on the ramps with the street style factory tires?

I'm looking at 03 - 07s but will probably stick with something closer to 2003. What are your opinions on mileage? I found a REALLY clean 1 owner Escalade with 86K on the clock...is that too many? I'm leary of it but maybe thats being silly.

Marcus