A heavy rescue vehicle is a big truck that helps people who are in trouble. It's like a superhero that can go really fast and has special tools and equipment to rescue people in emergencies.
For example, if there is a big car crash, the heavy rescue vehicle can come to help. It has special tools that can cut through metal to help get people out of the car. It also has a big generator and lights so it can work in the dark.
The heavy rescue vehicle also has things like ropes, pulleys, and airbags that can help lift heavy objects or move things out of the way. It's kind of like having a big toy box full of fun tools, but instead of playing with toys, it helps save people's lives!
So, in short, a heavy rescue vehicle is a big, powerful truck that is equipped with a lot of special tools and equipment that are used to help rescue people in emergency situations.