Another tire size question

Thanks for all the replies to my last post. Here's another question. How tall is a 235 75x15 tire? I know some people say 30x9.50's will fit with no rubbing and some with minimal rubbing at full lock. I also know different tire manufacturers 30" tires aren't 30". Is there a big enough difference between different manufacturers to make a big rubbing difference with no lift? I'm curious because I'm leaning towards Trxus tires and I've read a 31" tire comparison in JP and it said that the Trxus were the closest to being an actual 31". Thanks.
Mike Harris

Your 235 = Diameter=28.9"; Section width= 9.3"; Section height= 7.0" I only rub my 235 when backing and turning at the same time. 4LO.com has some east to use calculators for rires and gearing. good luck