Not really a rookie mistake. I caught my first steelhead at age 16 in 1956. I blame old age. The usual routine was that my buddie and I would back the boat into the river at Fuller and he would tend the boat while I parked the rig in the lot. On this day he went to the restroom while I launched the boat. I took the boat to the side of the rig and waited for his return. When he arrived he got in and I pushed the boat off into the river. As we were motoring under Fuller bridge, he asked me if I was going to put my rig in the parking lot. I had left my truck and trailer idling on the ramp with the motor still running. At least someone could have moved it.