Mine are R1s, yes I get some marks. Not bad... The best thing is to take off 4WD when the marking would be worst. The switch is right there where its handy, and you can go in and out on the fly.
If you are concerned about marking, maybe you should consider loading the tires yourself. It is fairly easy, and then you can adjust the levels, put just as much as you need, remove some during wet weather. Just a thought...