QOTD: Ride Like Jekyll and Hyde?

F250 front 34

The other day I had the opportunity to drive a new 2015 Ford F-250 pickup.  With the sheer variety in cab and bed configurations available on pickups these days, saying what it is often doesn’t paint the entire picture.  This particular example was four-wheel drive, with an extended cab, and the 8′ bed.  It was powered by the standard 6.2 liter V8.

F250 top view

Despite its sheer presence, it was quite easy to drive.  It rode like a Lincoln of yore on smooth pavements.  Then it happened.  An occurrence I have experienced before with a few other vehicles, it is irksome despite it being a natural phenomena.  On concrete pavements having joint spacings of both 15′ and 30′, the spacings conspired with the 158″ (401 cm) wheelbase of this pickup to cause a harmonic that will shake any extra insulation one keeps around their midsection.

I have experienced it in an extended cab 2007 Chevrolet Silverado and to a lesser degree my 2007 Ford F-150.  In each of these instances, the wheelbase is longer than the norm.

F250 rear 34

So, the question:  What vehicle(s) have you driven that demonstrated unorthodox behavior in some situations?  What was the vehicle and what was the situation?