Travel Voucher for Retirement PPM

I waited until just before my 5th anniversary before using PPM move, so I've been out for a while and have brain dumped a lot of this info. I can't reach the transportation office at origin and there isn't an installation nearby at my new location.

For Section 15c, is my rented moving truck a Commercial Transportation at own expense (CA) or Privately Owned Conveyance (PA)?

I've downloaded a few travel voucher guides that individual units put out and it seems privately owned conveyance means your personal passenger car, and my giant rental truck isn't that. But it seems commercial transportation means ticketed transport on a plane or train, and my giant rental truck isn't that, either. Please help! Thank you!