Well, fixed gear rugged high volume twin turboprop (PT-6 x 2)....FedEx is enamoured to the tune of 100 on order.
http://cessna.txtav.com/en/turboprop/skycourier
https://www.flyingmag.com/cessna-launches-skycourier-utility-twin

http://cessna.txtav.com/en/turboprop/skycourier
https://www.flyingmag.com/cessna-launches-skycourier-utility-twin