Sliding a car up onto a flatbed tow truck typically involves using a winch or a hydraulic system. It is also important to know when to use a flatbed truck for towing a car? 

Here’s a general step-by-step guide for slideing a car:

1. Prepare the flatbed: Make sure the flatbed of the tow truck is clear and ready to receive the vehicle. Lower any necessary ramps or platforms.

2. Position the tow truck: Park the tow truck in a position where it aligns with the front of the vehicle to be loaded.

3. Attach the winch or use the hydraulic system: If your tow truck is equipped with a winch, attach it securely to the front of the vehicle. If it has a hydraulic system, ensure it’s operational.

4. Engage the winch or hydraulic system: Slowly begin to pull the vehicle onto the flatbed using the winch or hydraulic system. Make sure the process is controlled and gradual to prevent damage to the vehicle or the tow truck.

5. Guide the vehicle: As the vehicle is pulled onto the flatbed, have someone guide it to ensure it stays centered and aligned.

6. Secure the vehicle: Once the vehicle is fully on the flatbed, use straps, chains, or other securing mechanisms to hold it in place during transport.

7. Check everything: Before transporting, double-check that the vehicle is securely fastened to the flatbed and that all safety measures are in place.

8. Transport the vehicle: Drive the tow truck with the loaded vehicle to its destination, following all safety regulations and traffic laws.

It’s essential to follow proper safety protocols and have the necessary skills and experience to operate the equipment safely. If you’re unsure, it’s best to contact a professional towing service.