the radials are ok on the road, I dunno about the 18 psi, I know the beads are good for 12 psi, I drive mine on the road every time the ute comes out of the shed it does a couple of hundred kms havnt had an issue yet
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My mate had a set of 35" radial treps they were pretty good for about 15k then they must have gone out of round and no end of balancing would fix the problem. I think he may have been talking about the stickys running at 18psi. If i was forking out 500 odd dollars if not more per tyre I wouldnt want to see them ruined by something they arennt intended for plus unless geared properly would become a bit of a slug on the blacktop especially with a soft compound high grip tyre.