Buyer's remorse??

Herimpression wrote:
Off the top of my head it's a 2009 1500 suburban V8 with a cooling package/tow package.

That helps as I suspect a 2009 would have the improved 6 speed transmission rather than the older, wide ratio 4 speed I have in my Avalanche. Axle ratio is also critical as too many of these vehicles were equipped with non-tow friendly ratios, including the 3.42 I'm running in my Av. You'll want the GCWR for your particular version of Sub (should be in your owner's manual) and it's GVWR which should be listed on the door jamb label. Payload will also be listed but it would be better to actually weigh the truck with a full tank of gas, if the driver is in the vehicle at the time of weighing subtract that weight from the scaled weight ... subtract that number from the vehicle's GVWR and you'll have it's real world payload capacity as it sits there ready to be hitched to a trailer. You'd probably want to also account for an average 100 lbs for the weight distirbution system that you'll have to use when towing, the object being to keep in mind that whatever payload you have available is used to account for the weight of everything added to the vehicle - people, cargo, and any tongue weight transferred to the truck from the trailer.

I know it has airbags that inflate when you hook the trailer to it.

Airbags may make the truck look "pretty" - i.e. relatively level front to back - but won't do a thing to put weight back on to the truck's front steer axle once the trailer has been dropped on to the hitch ball. For that there is only one solution, a properly sized and adjusted weight distribution system. Believe it, you need it, no exceptions.

When I called the dealer to say hold the deal because I just learned this is unsafe he said he has sold this trailer to people with my exact vehicle before. He insisted it will be fine and said that he's never heard of the length of the TT being an issue and kinda laughed it off.

That would be a typical response from most dealers who think they already have a deal in the bag. Sometimes it's just better to say you're just not comfortable with the deal and just leave it at that, no explanations necessary. ;)