It's my understanding that they will let you arrange to meet them somewhere in the greater Orlando area to pick up your box. For example at MCO if you're flying in or at a car rental agency. I am sure you could arrange somewhere else too if that's what would work best. You just need to supply a time & place when you schedule your delivery.
For our next trip we're spending a week at BCV then renting a car to drive to Vero Beach for 3 nights so we'll get our box delivered to BCV. We will take it to VB with us and then on our return I plan to arrange to meet them at the car rental return at MCO.
You didn't say where you are driving FROM but I'm sure they must have a delivery radius within the greater Orlando area...like Carol said, just contact them thru their website or call them to ask.