Gemini Twinranger and Bell helicopter did this before. Cancelled production for a variety of reasons...acquisition costs were obscene vs a single. DOC and availability were worse than a twin since you were pounding one engine significantly worse than the other. Biggest issue seemed to be how uncompetitive it was to lug around an extra $400K dead weight when you usually only wanted 1. Hard sell... Easy to get "40% reduction in fuel consumption" by removing half of the fuel consumption...
Bell 206LT TwinRanger & Tridair Gemini ST, pictures, technical data, history - Barrie Aircraft Museum