Backing with a trailer is dangerous because: Question Backing with a trailer is dangerous because: Answers It is difficult to see behind the vehicle. Most trucks do not have the ability to go in reverse. Cargo may fall out of the trailer. Explanation Backing up is always dangerous because it is impossible to see everything that is behind you. Only drive in reverse if it is absolutely necessary. This questions appears in the following tests: Iowa Passenger Iowa Passenger New Hampshire Class A Knowledge Test New Mexico Class A Knowledge Test New Mexico Class B Knowledge Test South Carolina Class A Knowledge Test South Dakota Class A Knowledge Test Vermont Class A Knowledge Test Virginia Class A Knowledge Test