What if police develop probable cause to believe a readily mobile vehicle parked on private property contains incriminating items subject to seizure? Should police obtain a warrant before searching...

What if police develop probable cause to believe a readily mobile vehicle parked on private property contains incriminating items subject to seizure? Should police obtain a warrant before searching such a vehicle? What if police knew the owner of the vehicle was about to leave on a cross-country journey to visit family? What if police knew the owner was planning to begin the journey in about a week?