[Wavery]

Can you post pics? I'm thinking that you may be a little over cautious here.

You can get hard rubber chocks that do a very good job of gripping concrete. As the trailer tries to roll forward, it rolls up on the chock applying more downward pressure on the chock giving it more gripping power. Unless your driveway is extremely steep, chocks should be fine unless the driveway is coated with motor oil or something.