Specs on weight "Tiers" for VSAT feeds

I once again did a www search for it, and perhaps I can't find the right terms, but I can't come up with any details on these Tiers and other Classes....

A few Vendors spec sheets give actual weights with their Tier number, but there seems to be no standardized values for xxx-1 and xxx-2 etc... It would depend on the length of the assy as well?

Con game enabling cheapo consumer dishes?

Any help?

Christian