If one wheelchair and one passenger are on board, about two normal-sized suitcases can be loaded with plenty of room. However, when a tall person sits in a wheelchair, inconvenience such as reduced head clearance may occur due to the interior height of the cabin is about 130 cm (51 inches).
In particular, if you use a large motorized wheelchair, there may be restrictions depending on its specifications. There is the page that introduces the motorized wheelchairs Wilgo served with so far. Please refer to it.