Nissan: Buzzing in my Frontier

Just picked up a Super Charged Frontier Crew Cab long bed. Really nce truck.
There seems to be a thin plate or shield that is vibrating at certain resonate
frequencies such that it sounds like a loud buzzing. It comes and goes as I
reach certain speeds and engine loads. I may eventually take it in to be
looked at but if it's something simple that someone here has experienced it
would save the hassel of dropping it off at the shop for a day.

Also, the right rear speaker rattles just a bit when listening to voice
although I do not notice it with music. Is this something common?

The third noise is the driver's side wiper arm that squeaks as if some rubber
is slipping or rubbing.

Are any of these sounds familiar to anyone here?

Other than these annoyances, I have really been enjoying this truck. I got my
wife am Xterra two days afterwards so we're almost a Nissan family now. I've
still got my 440 Six Pack Charger in the garage that I drive regularly so I've
got a little Mopar left in me.

Glenn

In article <YdNLb.1523$gnilink.net>,
usremove says... 

Nope. Just an XE for the wife. She's completely happy with it.

Glenn