If turning radius specs are not published, measurements should be compared:

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Turning radius describes how tightly a vehicle can circle on a flat plane. When a published radius isn’t available, you gauge it by the lateral space the vehicle needs to complete a turn. That means focusing on side-to-side movement—the width of the turning path from left to right—as this directly reflects the size of the circle the vehicle traces. Front-to-back would relate to wheelbase or length, not the turning circle; top-to-bottom is a vertical dimension and not involved in turning; diagonally mixes axes and doesn’t represent the actual turning path. So, side to side is the best way to compare turning capability.