My dad owns a 2004 Honda Odyssey mini-van and it has three different brands of tires on it.They are officially all the same specs (P225/60R16 M+ S), but the two front are different from each of the left and right rear tires, in terms of brand and maximum recommended inflation pressure (front two 35 psi; back two 40 psi).Is this a safe situation, or should one always use four matched tires on the same car / mini-van? Actual tires are:- front left and right: BF Goodrich Revelation 97S- rear left: Bridgestone Weatherforce Plus 40 97S- rear right: Bridgestone Potenza RE92 98TAre these tires any good?And what would other recommend as a quality set of four tires (safety and durability over performance) for this mini-van?And what is a reasonable amount to have a matched set of four tires purchased and installed?Most of his driving is just around town, but he does occasional highway driving, where he tends to drive around 65 mph when the speed limit there allows it.