Rock guards ?

I'm in the process of stripping my boat trailer, noticed alot of rock chips on the front of the cross members.
Does anyone use or recommend, a rock guard, rock tamer, etc. ?
It will go on a Nissan Frontier.

I think you care more about your boat trailer than I do. Trailer is all function for me.
My RV has a rock guard on it though.... incredibly annoying, gonna yank it off one of these days.