I have P215 75r 15 Toyo Extensa tires . I think they are 4 ply . I have a big heavy car so the front tires always look low on air. Have to have 38 psi on front tires and still look low on air . Tire shop said i could go with a light truck tire that would have more ply, but could a person find a tire that does not look like it should be on a truck ! Or another option is to increase rim size , this would reduce the amount of side wall. The down side to a larger rim size is more cost per tire. If i did increase rim size what would be an ideal rim size ? The rim in photo i have 4 , might not use them, but maybe could put 235 60 15 tires on those rims to reduce side wall. Staying with a stock 15 inch rim keeps the car original . any ideas ?