Trailer Bunk Question....Lag Screw or Bolt?

Guys...I am going to be working on my trailer bunks this weekend. I am considering fastening the new bunks on with lag screws from underneath vs. running bolts through the entire board and fastening with a nut.

Any thoughts on whether lag screws are acceptable?

Dave,
I agree that the lags aren't the greatest idea. Yes, to much wet/dry. They won't hold very well after time. It's come up several times that the best way is with hex head bolts. Just counter bore the top side of the wood so the heads are below the surface then, if you ever have to remove them you have something to grab onto (the hex head). This is better than carriage bolts where the square under the head never really grabs especially with some years on them. Double nut or Nyloc nut the bottoms of the bolts. This is also important due to the swelling shrinking the wood goes through with the wet/dry.

I appreciate advice guys. If I went with lag screws, I could put the carpet on the new bunks now, and install them quickly at the lake. If I go with the bolts, I will have to wait to put the carpet on after I drill and counter sink holes. I bit more of hassle, but, I do agree that bolts are probably the way to go.

Steve....I like your idea. Plus, by having the head of the machine screws on top of the bunk, you can get to it with a screw driver to work on it with out having to tear the carpet off the bunk.