I have 15s on my truck..almost impossible to get a good 15 inch tire. Nowhere sells LT tires for it. Had to go to some off shore brand. Most cars are 16 or better and the the tire makers aren’t making many 15s. I’m running 16s and 17s.. With your car being so big the bigger tires would look good on it. I could have gone bigger and it wouldn’t look like they were too big. I know a few years down the road I will be able to find tires for it...but the 15s are going to be a hard find...just saying..