if you want strength with spacers, run ARP studs in the hubs, and then run another set of ARP studs in the spacer. Gets spendy, but best bet when it comes to larger spacers. I've been running 30mm rears on road course for a few years now, no problems. Only issue you will run into is extended studs cant be installed in the rear unless you remove the hubs, not enough clearance.

And you'll burn up hub bearings faster running large spacers.