There is no container at the posted coords. You should finish the 5 stages of the AL to get the info you need for this bonus. The bonus is nearby, but outside. You will not need to move your car from the AL parking. Several of the attributes are correct for the AL since you need to complete that to find the bonus container. The AL is only available at certain hours, and therefore, so is this.
37.7156AB,-76.379CDE
Bonus is a black bison tube just big enough for the log.