Thank you.
and sometimes, the box will spin the wheels a little.
It is easy)
1)Every wheel have a sensor. When sensor collide with ground, it means that robot can jump
-look at front wheel. It is in air so sensor not collide with ground.
-but bottom wheel sensor collide with ground so robot can jump
2)Jump
Add force to body
game.player_e.car.base_body:apply_force(is_hook and balance.jump_power_hook or balance.jump_power)
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I see, and when the box in in between the wheels, it constently touches the sensors.
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Which causes infinite jumping.
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and you made the sensor a little thiner then the wheel so the player can’t wall climb
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Yes) So in theory to fixed it i need to make it impossible to glitch box between wheels)
Mb add some check and remove box collider if it stuck between wheels:)
In practice i will not fix it) 
I already found another way of doing it, it involves the arm swinging through the player in a very low roof.
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If you let go of the box at the right time, you could in theary get the box in the wheels.
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also, this happened because the arm trying to reset to its original position.
and to stop the infinite jump in another way is to thin the sensor by the inside.
and I somehow was able to do this too, by accident.
and this.
