Intersting that a Cummins product would feature a Ford engine. Then again, the Cummins 6.7 could be had in the F650 and F750s until recently too.
Cold start might be a pain, but once is spinning, it'll run untill its out of fuel.
My dad had a Ford Leyman diesel in his 44' Hardin sailboat. Never a single issue with that engine.
The 300 l6 is a gas motor. Looks like this one was converted to propane which is pretty easy to do.
It's one of the most durable gas engines Ford has ever produced. So smooth and a ton of torque. Great motor!