How to handle mileage deduction for a Partnership LLC when the vehicle supplied was not own or leased by either partner

Need some help here on this situation. My son and daughter started partnership LLC  in 2021. The business involves driving to places to pick-up materials used to make a finished product and also for attending vendor markets where they showcase their goods. I loan them my truck (I'm not on the payroll as a employee) for this purpose and they haven't generated enough income yet to reimburse me for the cost of use( how generous am I?). Is there anyway to recognize this expense for the partnership or for me personally as we are talking over 3000 miles driven for business purpose.