Moving floor is a low profile light weight flexible slat conveyor for trailer and dock to load and unload mixed pallet loads and unpalletized loads for high speed, high weight short shuttle operations. Loading a trailer in less than 1 minute using 3 phase or 24v electric motor gearbox drives controlled by an invertor to give matched conveyor speeds, ramp up and ramp down control for speeds of up to 30 meters per minute and 30 ton loads. Move slat chain conveyors enable truly flexible solutions for handling loads of up to 60 kg/m. commonly conveyed types of goods are cans, bottles, containers and boxes. It can function over extended distances of avoiding transfers is a priority and/or when there is a need to suspend conveyor from the ceiling in order to make more floor space available. The drive unit is compact, reliable in operation and requires minimal maintenance. It can be complemented with an underslung drive unit, which provides grater flexibility when choosing conveying speed. The drive unit is adapted as a matter of course to the chosen conveyor. Among the features securing high operating reliability is return chain accumulation in the conveyor frame, which reduces wear and minimizes the mounting dimension.