When I worked along side MAF in Wewak and West Papua ( that’s how along ago it was ) all their aircraft were donated by supporters from the USA.
In Sentani they used Grand Commanders with RPM V8 conversions and triple skinned bellies.
Why the triple skinned bellies you ask?
One way steep jungle strips in the interior - on takeoff V1 was brakes release.
Running out of strip? Gear up and slide off on the grass !!!