He uses our grass airstrip to land and reload  

These people get paid by the acre but their planes fly by the hour.  The closer and  friendlier a landing strip is the more likely they will consider going any distance.  

Ideal is to land going up hill and take off going down hill & into the wind.  No obstacles to have to go over or under. 
Set up to  re load and just add power to take off with little or no ground travel/movement. 

A well trained ground crew helps a lot also.