HP vs altitude & gas vs diesel

OP, you're right in your statement on needing to wait for some OEM to produce a turbo gasser for an HD truck, if they ever decide to in order to avoid power loss in the higher altitudes in the mountains. Otherwise you are stuck with a turbo diesel. If there was a turbocharged HD gas motor out there, I would be weighing harder on whether to have bought a diesel or not. I know I don't want naturally aspirated, it's painfully obvious when a diesel passes you towing their favorite large toy hauler up at altitude and you're struggling with your gas rig with just a payload and no trailer. Hence why I no-longer own a 2010 F-150 (along with payload limitations)