Advice on a 3/4 ton Suburban

Our boat is a 2008 SAN 210. We have been towing it with a Dodge Ram that is less than convenient for our large family (basically have to take two cars on trips to the lake) and the ride is horrible while towing and not towing. We have been looking for something a little more family friendly and I have read good things about the 3/4 ton Suburbans/Yukon XL's.

We are trying to make a deal on a 2007 2500 Suburban that appears to have been lightly used and well taken care of, but before I finalize it I want to make sure I am not making a mistake. I know I wont be able to drop the hammer up the hills with a gas engine versus the Cummins, but I don't drive like that anyways, so that is not a huge issue for me.

Looking for any advice I can get from all the people using or who have in the past used a 3/4 Suburban to tow a boat similar to ours. What was your experience towing with this vehicle?