A dealer who owns or operates a vehicle used for the transportation of liquefied petroleum gas shall maintain motor vehicle liability insurance of:
1. At least five million dollars for the transportation of liquefied petroleum gas transported in cargo tanks, portable tanks, or hopper-type vehicles with capacities of three thousand five hundred water gallons [13248.94 liters] or more.
2. At least one million dollars for the transportation of liquefied petroleum gas transported in cargo tanks, portable tanks, or hopper-type vehicles with capacities of less than three thousand five hundred water gallons [13248.94 liters].