One fairly consistant problem I have seen in a number of aluminum trailers, is a distortion near the front hinge on the top. It allows the top to shift forward and creates interference at the rear with hard closing and misalignment of the latches. The distortion appears right at the corner. I believe it occurs with the forward loading on the top coming from the rather strong gas struts over time.

Of the five aluminum Cobra trailers parked at the field, three have this problem. None of the fiber glass top trailers show a similar problem.

Buzz Graves