The 185 Cessna got more horsepower, STOL flaps and a belly pod for 300 lbs of cargo. The Aztec twin was rebuilt with the Geronimo Package, i.e., from the PA23 airframe, got more horsepower, a longer nose for baggage and wing tip tanks. The Geronimo is restricted to fields of adequate length. Fog in the AM is common. Calculations and adjusted weight is critical before every departure.
Nothing is left to chance.
Corrosion is a problem. David says his flying becomes second nature after a while. To navigate those small strips you keep a nice profile and watch your airspeed. He communicates with other islands by short wave radio. The lap top helps with paperwork.