1. For safety: Keeping the dolly under the trailer while it is being disconnected can be hazardous. If the dolly is not properly secured, it can unexpectedly roll or slide out from underneath the trailer, potentially injuring anyone nearby or damaging the trailer itself. Disconnecting the trailer with the dolly pulled out eliminates this risk.
2. To maintain stability: When the dolly is removed from under the trailer, the weight of the trailer is evenly distributed on its landing gear, which provides greater stability. This is especially important if the trailer will be parked or left unattended for a period of time. With the dolly in place, the trailer may not be as stable and could be more susceptible to tipping over in certain conditions.
3. To avoid damage: Leaving the dolly under the trailer while disconnecting can put unnecessary strain on the dolly's frame and components, potentially causing damage to the dolly. The weight of the trailer pressing down on the dolly can also make it difficult to disconnect safely and smoothly. By removing the dolly before disconnecting, you can help prevent any damage to the dolly or the trailer.
4. To simplify the process: Removing the dolly before disconnecting simplifies the process of separating the trailer from the truck or towing vehicle. It allows for easier access to the trailer's landing gear and the kingpin, making it more convenient and efficient to disconnect the trailer.
Overall, pulling the dolly out from under a trailer before disconnecting it is a safety precaution that reduces the risk of accidents, improves stability, prevents damage, and makes the disconnecting process easier and more efficient.
