IMO a better idea would be to get an Odyssey. Your kids can get in by themselves (saving your back from lifting them into the middle row), and it's easier for them to get out. More cargo room to boot. Don't forget better mileage :).
We looked at Suburbans, and ended up getting a van. I don't tow anything.
Bad Idea IMHO. I bought one of those new, planned to drive it 6 years, but only kept it less than a year. I found the suspension rode hard, and the seats were also exceptionally hard. The combination made for an uncomfortable vehicle. As a result, I reluctantly got rid of it, as otherwise, it was a nice vehicle.