Joint (with is kinematic) work like a child, 100% fixed, without little bounces?

As I exposed in the post link text, I am creating a Forklift Game. I solved how the fork must manage the packs, moving them on the 3 axis, the fork is a rigidbody without "gravity" and with "is kinematic". I need the fork be "child" of the car. The car has the player car script and also has a rigidbody with gravity. The problem, we know that one rigidbody can't be child from another, in fact, putting the fork child from car all the physics goes crazy. I tried put "Fixed Joint" on the fork, but as it is checked with "is kinematic", the car can't move, both objects keeps unmoved. If turned off "is kinematic" from the fork, the car can move, but result of joint is not what I need, the fork bounces a little in all axis when the car is moving, and I need the fork appears to be 100% fixed on the car, like a child. I can't figure how to solve that. Tips? Tks!