Sorry I'm late to this party, congrats on the new truck!
FYI for all those who said the Suburban wouldn't do the job, just not true. The new High Country Burb with 6.2L and 10-speed automatic has almost the same ratings as my 2001 2500 with 8.1L. Heck the 6.2 puts out 420 HP and 460 TQ compared to the old 8.1 at 340/455. The 10 speed trans lets it run with a 3.23 rear axle. Max trailering is rated at 7900, so with the family loaded in would likely be overloaded in this application. The Ram is a better choice here, but the old "half ton" concept is dead.
GM discontinued the 2500 series burb for 2 reasons: 1. Crew cab pickups have gotten larger with a roomy second row, so unless you really need that 3rd row they fit the bill for towing/hauling heavy, and 2. The drivetrain capabilities of the regular burb have closed the gap with the 2500 to the point where you don't need a big block to tow anymore.