I went to the desert today, easy trails ( you could take a honda civic there...) A bit bumpy, the truck is doing nice but there is some "banging" toward the rear/ cargo area. Kinda a loud and morenof deep tone sound. My cargo area was empty and there is no jack tool kit (guess the previous owner wanted a souvenir...)
There is quite of wind noise at about 65 on hwy, seems to come from front passenger side. Is that "normal" for this truck ?

Not specifically hummer thing, but anyone knows what is that little switch ? I thought it was some bluetooth but when scanning with my phone i dont see it.

 

I dont know anything about the little button. And the only thing I can say about the wind noise is that I've never heard that on my h3 but I replaced my antenna the first day I got it with a small 8 inch rubberized antenna, so maybe it's your antenna? Just my 2 cents.
As for the sound that you're describing the back, that did happen to me early on and if I recall correctly the spare tire was loose and I had to simply tighten it down on to the rear door. Hope that helps.

 

Ill double check the spare tire just to be sure but it sounded like it was ...i dont know....lol. Maybe like i had a 20 lb of something in the trunk that was jumping and hitting the floor.. Very hard to describe a.sound.

The truck already have the small rubber antenna, I'm wondering if its not the plastic "frame" that run on the side of the windshield to the roof.

 

Many don't know how to use this either:

 

Is that something from starwars or startrek?

 

LOL. ,been 50 years old it brings.back memories

 

That switch thing is a gift from the prior owner, push it at your own risk.

Get underneath and LOOK. How many miles on the shocks. What do the sway bar links, exhaust hangers and leaf spring bushings look like? If any of that loose or broken?

 

I'll check after work today. No clue how old are the shocks but they are not OEM. The truck has about 108k miles