Rob,
I'll bet it will clear the hump just fine. You could find a spot where there is a slight hill, and back your trailer up to that to lessen the angle of the ramps, but I'll bet it won't be a problem.
On our car hauler, on level ground, the ramps end up about the same angle as the hump, maybe a tad more, but not much. Here's a couple pictures of mine.
Picture 1
Picture 2
Lot of folks use these same trailers for race cars and such and they are pretty low to the ground.
Just remember that the car has a suspension and should be secured well, as they can bounce around a lot more than a tractor.