Also,
Try a different stretch of motorway for your road tests.
Many years ago, the M4 was quite corrugated between certain on/off ramps and this caused much drama when road testing vehicles.
I then used a different section of the M4 and all vibrations gone.
Try a different stretch of motorway for your road tests.
Many years ago, the M4 was quite corrugated between certain on/off ramps and this caused much drama when road testing vehicles.
I then used a different section of the M4 and all vibrations gone.