ORIGINAL: mred33
If the trailing edge is not very thick, like 1/4 squre, I put blocks inside the trailing edge to re-enforce it. Make a hole all the way through the basla to let the glue go all the way in without creating pressure inside the hole and gives the glue some place to go.
Just to ilustrate this here is the stab of my 23% Wilga. The trailing edge is very light so there are four blocks of balsa glued to TL and ribs for hinges. Also you can see hinge holes all the way through like mred33 mentioned.