For that distance, I'd probably get a dolly (rent or buy-used). Obviously there are costs for the dolly but you're probably looking at a good $200 of gas to drive there not to mention the wear / tear of 1500 mile drive.
Personally, the biggest difference will be the convenience of only having to drive one vehicle. You'll probably have to stop more often with two vehicles (two drivers getting tired, two vehicles to fill up, etc) and as stupid as it sounds, just following each other on a 1500 mile trip is not trivial.