The rear wheels shouldn't wobble (or at le4ast mine doesn't). Have you had the wheels off at all? Just wonder if the wheels are not sitting on the little bar on the axle.
If you remove them and look inside the rear wheel you will see a cross. If you then look at the axle youll have a blue spacer (in your manual its part number 96088) and in front of that a roll pin (7369). That roll pin should sit in that cross of the wheel to keep it steady.
Hopefully its just something as simple as that.
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