First, make sure the toad is absolutely straight behind the coach. Most any angle at all will bind one side or the other. So will any grade, up or downhill, so try for a level spot. If the tow bar arms have latches to lock them in the extended position, release those before attempting to remove the pins. It can take a lot of pressure sometimes.
When the ideal cannot be found, there are some tricks to try:
1. Use a twisting motion on the pin as you pull.
2. Start the car and turn the steering left and right. This often wiggles the front end enough to relieve pressure on the pins.
3. If on a grade, start the car and out it in gear, moving it just enough to relive pressure. Be very careful! If doing this alone, use the park brake to hold it in the right position to release the pins. If you have a helper, be extremely careful of crushing a finger or leg between toad and coach/towbar.
4. As a last resort, a rubber, wooden or soft brass mallet can sometimes be helpful.
