for me, a boat that only has 8 hours and is a dealer demo should be like new. 2000 miles round trip is several days. not even factoring what your time is worth that's a grand to go, pick it up and drive back in gas/hotel/food not to mention wear/tear on the tow rig.
negotiate them wrapping the boat for shipment in the deal(that's like $150 for them in labor/materials) and pay someone off uship $1200 to transport it for you and I'd sit at home waiting for it. the few additional $$ spent on transport would where my cash would go.

my comfort level buying a dealer demo with 8hrs wouldn't require a lake test but everyone is different in that regard.

either way good luck......