Jim.....A few things....Often your coach will sit higher in the rear, can you reverse how you're placing it in the driveway to eliminate maybe a few inches that you need.
Second, why do you have a need to get it perfectly level in your driveway....do you intend on living it? If you need to do something that requires leveling, maybe you can pull it out in the street for awhile.
If you must get level, and it's going to sit for a month or so at a time I would level it in two stages. Make some ramps that get you about 10" high and then use a bottle jack and some jack stands to take the weight off the front end (do not lift front end off of ground/ramps) the remaining few inches and keep supported with the stands.