Wages plus taxes and insurance, not just the pay rate.
Fuel, maintenance, insurance, depreciation.
This leaves out callbacks, office time and your own unpaid hours. Orbit's profitability report (Business plan) counts callbacks against the client that caused them and uses the hours your techs actually clocked.
Try Orbit on your route for 30 days.
Add your clients and your techs, run a week. If it does not earn its place in the truck, nothing to cancel and nothing to pay.