How difficult would it be to build a semi-autonomous system where e.g. the forklift operator (or whoever else is involved in unloading/loading/connecting the tr

How difficult would it be to build a semi-autonomous system where e.g. the forklift operator (or whoever else is involved in unloading/loading/connecting the trailer) performs the manual actions on the trailer while the robo-tractor does the parts that require driving?