Airvan MTOW
Operating an Airvan at its current MTOW (1814kg) out of 600-800m bush strips with tall trees at either end, has given me a few gray hairs. The extra power is vital in this case.
But yes on any other runway it does a wonderful job as a work horse and could take more weight.
A pilot in PNG took off in an Airvan at what he thought was MTOW (but he forgot to unload 100kg of rice in the pod!), he felt no difference in control or runway used and was thankfully in trim. So a MTOW increase seems feasible...