1990 Honda Accord Owner's Manual - Page 76
1990 Honda Accord Manual
Page 76 highlights
Parking with a Trailer Whenever parking your car on an incline with a trailer attached, place and seat chocks at each wheel of the car and trailer. This is in addition to the normal parking preparations of firmly applying the parking brake and placing the transmission in first or reverse (manual transmission) or P (automatic transmission). CAUTION: Parking on an incline is not recommended and should be done only if it cannot be avoided. Follow all precautions mentioned above and turn the wheels to point towards a curb if facing downhill, away from a curb if facing uphill. When leaving an inclined parking place, move the car slightly to unseat the chocks. Then while keeping the foot brakes firmly applied, have an assistant remove the chocks.