I'm about to start running a new Dark Sun campaign, using the 2nd edition rules and the original (so not the Revised & Expanded) Dark Sun boxed set. However, we've got one problem: the party's Half Giant has a strength score of 22, but the encumbrance tables in the PHB only go up to strength 18/00. Does anyone know if there were ever any expanded encumbrance tables published, in either an AD&D supplement or a Dragon Magazine article?

If not, does anyone know of a fanmade expanded encumbrance table? Or if there's a set methodology to calculating encumbrance levels? (I haven't been able to discover it)