More information would be required. What offset (or backspacing) do they have? Is the vehicle stock height or lowered? Using a factory frame or aftermarket? Assuming you have disc brakes?

I'm also thinking you're stating the overall width of the wheels not the inside bead to bead. Bead to bead is how wheel and tire manufacturers both define the width. Overall wheel width is about 1" wider. A 235 on an advertised 18x9 (10" overall width) would be very stretched (as would a 255 on an 18x10).

Check your static alignment camber. If it's positive, not only does that play a factor in tire fitment, but handling as well. If you can dial in 1/2 degree negative camber it may help avoid the rubbing and make a huge difference in the handling.

If you were planning to rebuild the suspension, another thing that can help is using Proforged 1/2" taller upper ball joints. This allows the tire to camber in more at the top as the suspension compresses. This is mainly done to improve handling, but a side-benefit would be additional clearance.