Crack on the side of my trailer

Dick_B wrote:
Quick drill a 1/16 hold just beyond the end of the crack. Be sure to be beyond and not in the crack itself. The hole spreads out the force that is causing the crack. It's easy to fill the hole with epoxy but fixing the crack is priority 1, of course.

So far, silicone is the answer I have gotten on fixing the crack. Is that the solution, or at least the only halfway economical one? At least that's not difficult. The hole to be drilled-Do I just penetrate the outer surface or go all the way through the trailer? I don't know if it's fiberglass bonded onto aluminum, pure aluminum or exactly how it's made.