We have them. I guess not many MKIII owners are interested or invited to come to the meets (set up on Supraforums.com). Since I have both, I wouldn't know.
I am of the opinion that if your car wears a Supra badge or is powered by a Supra-derived engine, you are welcome to come. MKIV owners are pricks, but only to owners of other cars
If you guys want to set up your own separate meets I will come to those as well.