An adapter device to be used with a standard roll-off truck to allow said truck to lift and transport standard front-load containers; said adapter device comprising a rigid support structure adapted to engage with the bed of the roll-off truck; an engagement structure integrated with the support structure and adapted to be engaged by a hoist mechanism of the roll-off truck; and a lift structure integrated with the support structure and comprising a pair of parallel forks adapted to engage with the standard lift fittings of the front-load container.