towing up a steep driveway

Hi,

We bought a 2004 TM 2720 today and happily drove home ready to play (and to fix the broken items) and we arrived to find out that our driveway is too steep to get the TM up it without bottoming out! This was totally unexpected as our driveway really isn't that steep to us. Any ideas? Some friends suggested castors or something for the back but we don't want to hurt it. On the other hand, we can't leave it parked on the street for more than a few nights before the HOA will get after us.

Thanks!

-Amy