In the Kewaskum Fire department, we use a standard checklist style inspection sheet. We run routine inspections bi-monthly. We go through all the vehicle fluid levels, check tires, warning lights, siren, and radio system. The pump is exercised as well. With the pump drained, and not engaged, the valves are exercised. The pump is engaged and set to recirculate. The drip rated is checked, and the primer is exercised, and primer fluid is checked/added. If you are in a metro department that doesn't draft, it is very important to exercise the primer to keep it from burning out, or stuck if ever needed. All of the equipment on the vehicle is inspected and run as well. If the vehicle is less than 75% full of fuel, it is refueled. As is all of the small engine equipment run.
As far a pre-trips go, our HEO's only have a few things to do. In winter, the drains are left open in the firehouse, so the first thing the HEO will do is start the engine, close the drains, and check for open doors, or anything obviously out of the ordinary, ie, flat tire, etc.
We are luck that in our combination department, that we have members who are handy with maintainance. We have a member who is a diesel mechanic, so he can fix mostly any problem we run into, and every truck gets preventative maintainance, (oil change, complete filter change, chassis inspection, and every hinge, and moving part is lubricated.), once a year whether it reached it's mileage limit or not.