Securing the guncart to the Neuton wagon

Hi Cowboys,

The picture shows the axle passing through the Neuton hauler box just in front of the rear wheel. The key keeps the axle locked in place. An identical arrangement is on the opposite side. The axle passes through the gun cart base. A second axle with like arrangement passes through the front of the tub and again through the gun cart. This secures the gun cart so it cannot move unless the axles are removed. The rear axle of this arrangement will be used with the rear hauler wheels if the Neuton fails. Gotta have some way to keep going under any circumstance.