I'd advise against that. Get there early, and talk with the folks that allow boarding. I've found some crews are very gracious and allow a pre board. The full size case will fit in the overhead, you just need to be somewhere near the front.
Apart from that...say you get on the plane and realize there is no room. From the entrance to the plane, you may need to check it and when that happens it will go straight from the plane and into the cargo area...no skycaps, no trailor transport. You could even ask that they bring it to you just like they do wheelchairs.