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I will go with the ford explorer with Roll Stability contoll for this example. When IDS is hooked up and I monitor the PIDs for the wheel speed sensors and set all but the right rear to Spec Psi and the RR tire to 3 psi above spec I will see a slower speed pulse at the RR in comparison to the others. The module takes this signal and interprets an error in the vehicle's predetermined dynamics and acetates either a breaking reaction threw the abs module or the 4x4 module. This happens because the tires diameter has changed by comparison to the others. It may not be a dramatic change to the foot print visually, but it is when calibrated to a constant differential calculation.
The crown Vics weigh alot for a car. This is due to it's chassis, Wich is comparable to a truck chassis in that the body can be removed and will still support the drive train and suspension components. PDs usually have maintenance thre bidding shops, the lowest bid wins. The shops keep cost down by using nearly own quality parts. Tires are within that element. Higher pressure does increase the force on the bead to hold it to the rim. Mahwah PD uses Goodyear eagles and Forteras Wich are OEMs. They are a strong tire. With the PD mentioned I am assuming that Dept hadn't been paying attention to pressures and it lead to a longer and more even pressure over time.
Try the chalking technique from OEM pressure to about 10 over sidewal on a truck or SUV. The results will be more noticeable on a wider tire with an 85% sidewal measure.
The part about hydro seems a little off for the example given. In that the ski would represent a slick bald tire. A good tread can have treads over 1"tall (murders).
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