I have experienced through multiple attempts to complete the mission very odd behavior from the mission objective vehicle.  At some point, this has been from few minutes to immediately, after attaching winch to vehicle, the objective vehicle will be propelled in into the sky taking my vehicle with it.  This will leave my vehicle deposited on the map in the vicinity of where this initiated.  The objective vehicle will come to "rest" somewhere possibly on the ground, but usually suspended in the sky.  I have been able to winch the objective vehicle down from the sky when it is not out of reach.  The behavior repeats on second and further attempts at connecting the winch.  Substantial damage usually results to both vehicles, so there is a point at which no further progress can be attempted due to damage.