I told you in the other topic you had on this.
Socket on the tips of the forklifts, attach a different collision box to it during the begin play event.
You can put any mesh onto the socket, hide it in game, and still use the mesh collision settings which will trigger.
Then, because engine physics are unreliable at best when it comes to moving parts and kinematic, you just script the collision manually so that when those events overlap you counter the engine, or stop movement. Or whatever you need to do.
Maybe you want to check what you collided against for a tag and apply a different reaction for instance - so that you can attach a pallet to the forklift, or cause shelves to fall down… without having to change too much stuff around.