Trailer Bunk screws

[dlogvine]

Im changing bunks on my boat trailer and i noticed that the old bunks have the bolts with tying nuts holding them to the trailer frame. I did not take these bunks of the trailer yet, but I wonder as to what is the benefit of using through bolts (or possibly one side bolts, the other side screws instead of the regular screws I always used on my other trailers. Also I wonder if galvanized screws would be ok or I should go an extra step and get stainless steel screws? Thank you

 

[Lightwin 3]

I have both through bolted, countersinking heads below face of bunk, and bolted from underneath.

In all cases, SS fasteners.

When bolted from underneath (not through bolted) I sunk the screws with waterproof wood glue. I've never had one come loose..

 

[dlogvine]

I have both through bolted, countersinking heads below face of bunk, and bolted from underneath.

In all cases, SS fasteners.

When bolted from underneath (not through bolted) I sunk the screws with waterproof wood glue. I've never had one come loose..

Thank you, I'll go with bolting from underneath, I will try silicon sealant to protect the screws and holes in the wood.