A complex that functions in anterograde transport at the Golgi and also regulates autophagy. In yeast it includes at least the following subunits: Bet3 (as homodimer), Bet5, Trs20, Trs23, Trs31, Trs33, Trs85. TRAPPIII may include further, as yet undescribed, proteins. [ http://www.ncbi.nlm.nih.gov/pubmed/20375281 http://www.ncbi.nlm.nih.gov/pubmed/22669257 ]