How do I keep an object solid, while being hooked to another object?

I am creating a top-down game, where you play as a forklift, that steals cars. My main problem is that when the forklift "lifts" a car, so that the car's position is locked to the forklift, the car does no longer collides with objects. How do I make the forklift and the car collide with other objects?

dop2000 That is the solution I have found, but it's not the best since I want to pick up multiple items.