I'm doing some rust repair on my DD around the bottom of the jack receiver plates on both sides. The leaves and other winter wet detritus seem to collect there, and that's probably why the PO put fiberglass / bondo repair in there that I'm now replacing with honest-to-goodness steel.
In the process of rust treatment and steel replacement I've noticed that both the driver's and passenger jack receiver plate have a hole near the top but slightly off to the side. The hole is roughly the size of a dime and appears to be there by design, but why? Wouldn't water drain into that and sit inside the receiver plate? Should I seal that up with something (like seam sealer)? I don't see any sort of similar hole on the Restoration Design replacement pieces.