To answer the question why look at SXS tires: more options on the used market. Like a lot of people, I have desires that outreach logical financial reality. New beadlocks AND tires are completely out of reach. So what’s a fellow to do- search the used market. Mr Google shows me that locally there are a fair amount of 35” tires for sale, but generally they are 20” off a Superduty. I’m willing to move up to a 17” rim for the beadlocks, but not a 20”. The SXS crowd is not (yet) gone to 20” rims, so it’s an option. My rig does however tip the scales at 4500#, so maybe this is foolish. (Additionally, the deal on beadlocks got away from me, so back on the hunt).
And that is the long winded answer to why I ask the question.