My new Rav4 seat is killing my back. I have tried every way possible to adjust it but after 15 minutes of driving my upper back is killing me. I have purchased 3 different seat cushions but they are too think. The seat is too hard and doesn't have any back support. Plus, the steering wheel doesn't extend enough to keep me from leaning forward. I am 5"8" so it is not because I am too short to reach it. I have had this vehicle for 6 weeks and have had severe back issues since I got it. I have been going to the chiropractor but that isn't helping.