Glad you caught it yourself . Regulations allow it's use for several personal use situations. FedEx policy says must be unladen. A shame because it can be useful, allowing movement of truck while on lunch break.I was incorrect about the being laden part. I want to direct you to item #6 on in this FAQ though.
Personal Conveyance: Frequently Asked Questions | FMCSA
May a driver, who drops his or her last load at a receiver’s facility use personal conveyance to return to their normal work location (i.e. home or terminal?)www.fmcsa.dot.gov