I believe norman-spencer (not NSM) and amwins have a program. I know there are requirements but can't recall - something like they have to write the bop/pkg, might have to have 1 owned vehicle on policy..something like that.
Good luck, tough risk to place from what I remember.
I have access to a program for mono-line hired and non owned for pizza delivery. I am an underwriter at Hull & Company. Send me a submission. Reed.rhoden@hullstk.com
I have been working on a similar risk. I found Sunderland and IPC. You can get to both through Johnson & Johnson. All Risks also has access to Sunderland. The insured does have to provide recent MVR's for both.