 As there is no differential action between the wheels on each side, this causes a lot of wind-up in the bevels and shafts.Standard operating instructions for the Stalwart recommend that after travelling some miles on firm ground, the vehicle should be bounced over a kerb or railway sleeper to lift wheels clear of the ground, one-by-one, so allowing them to spring back and release the windup.Excess windup could easily lead to a broken gear in the bevel or hub gearboxes.