I just found some Monroe Air Shocks for a '69 Type 3 (I'm assuming it will work for all IRS models). These might be a good way to bring the car back up to level ride height with the extra battery weight in the rear. The other option could be to adjust the torsion bars up a couple of notches. I'm not sure how this affects the handling and the life of the torsion bars, however. I'm going to fire off a post to the VW-EV mailing list and see if they have some insight.