2019 Ford Expedition Steering Problem

We have a 2019 Fried Expedition with the heavy duty towing package.  When
we make a left turn onto a straight road it keeps pulling left until we make a
right turn which then cancels the left turn and then it drives straight.  This
condition is worse when towing our 6000 lb. trailer but still noticeable when
towing nothing.  This does not happen on right turns, only left.  Ford has
spend days testing and checking everything (mechanical and electrical) and
cannot find the cause.  I fear it is a design problem.  In any case it is very
unsafe.  Has anyone else experienced this problem.  Also we hitched our trailer
to another new (4 miles on the odometer) Expedition identically equipped as
ours with the same results leading us to believe it is a system wide problem.