Depends totally on the weight and volume you intend to carry and what distance you wish to cover.
You may want to look at a 200C which has a 1.33m x 1.33m cargo door on the left side with an airstair door built into the cargo door. Construction numbers of "straight" 200's start with BB-, 200C's start with BL-
Only 36 were built so they may be hard to get..
Empty weight is around 3318 kg and MTOM is 5670 kg.
This leaves room 2352 kg. Max fuel capacity is 1633 kg so with max fuel, 719 kg are available to load. Two pilots @ 80 kg leaves 559 kg of cargo. Not very spectecular. However, if you are looking for shorter hops and don't need the 5 hours fuel endurance, you may trade fuel for load.
Good luck !