Hey, I'll get him a case of any kind of beer he wants, for another of those!
Even the light weight Fortec Star 2.4 would be too heavy for the Stab HH-120.
They rate it for 4' dishes, not 6' nor 8'.
I've looked at getting a 6' Prodelin molded fiberglas dish, and the dish alone weighs around 100 lbs, so I'm sure your 8' will be that or more.