Tahoe vs Expedition vs Suburban to tow 5400 GVW TT

Yes the longer wheelbase will help to control sway issues if you were to have any. Very generally speaking, the longer the trailer, the more likely the sway, the less effective the shorter wheelbase is.

I tow with a 07 tahoe. Do I wish it was a burb? Maybe. Tough to say. I love my tahoe. If I had a burb decked out in the same fashion, and it would fit in the garage (im sure it would be maybe not as easy), then I'd probably be just a little happier with it.