I've tried a little bit of everything!
"Schedule C: Auto and truck expenses require evidence to support the deduction. Failure to provide this support on Schedule C Part IV or Form 4562 Part V will cause the e-file return to be rejected by the IRS. If the vehicle in question is a heavy truck, mark the listed property check box or use a method for vehicles over 6000 lbs. in the depreciation input to satisfy the IRS e-file specifications for Reject 183."