A tow-bar adapter for towing a loaded trailer behind a combat vehicle permits opening of a rear ramp door on the vehicle and supporting the open door on the adapter as the vehicle proceeds forward. The locking lug nuts each have non-hexagonal irregular key surfaces and the key has a non-hexagonal key element engageable with the key surface of at least one of the locking lug nuts. Consequently, that which results is a compound engine dynamo-electric machine that improves total efficiency of the engine by adding exhaust energy, which is otherwise discarded, to the engine motive power axis. The second layer contains high modulus fibers having a modulus of at least 8 GPa in a thermoplastic matrix. The inferior breaker edge is designed to prevent water leakage between the screen attachment and the gutter. The transfer apparatus controls a transfer sequence of transaction transfers by the bridge and data transfers by the data transfer unit, in which transaction transfers by the bridge are based on bus sequencing rules and data transfers by the data transfer unit are based on a data transfer activation condition.