[TowerTalk] Trapped Tribanders Turned Vertical

[Robert Pack, NX5M]

Without going into great detail with the reason this question is being asked......local guy wants to put a tribander up (an A3 I think) and wants to mount it vertically.  He asked me what I thought about it.  My first thought was water getting into the traps and not draining out, or draining out too slow.  
I have never seen a vertically mounted tribander (other than triband or better verticals).  I will admit that I have never looked closely at a trapped vertical so I do not know if there is anything different in the sealing of the traps or not.  Is there?

Could this fellow actually put his three element tribander vertical?  Should he seal the top ends of the traps and maybe put small pin holes on the bottom ends so water can drip out?  Any electrical or structural issues that come to mind?

I will print and pass along all replies.

Thanks.
Bob NX5M