Trailer towing/burning smell......

[JV1]

Took my first trip in the H3 this past week towing a trailer. It was a 2-place snowmobile trailer with one snowmobile on it. About 1,200 pounds total weight, 8" tires and a tongue weight of less than a hundred pounds. The back end of the Hummer had probably about 150 pounds of stuff in it.

A couple of things I noticed which have me concerned. First, anything over 70 mph caused the front end to vibrate right through the steering wheel. Seemed to vary between a mild vibration and pretty bad where you could see the hood shaking. Got to my destination, pulled the trailer off, went back on the highway: no vibration. Took the tires off the trailer checked everything out, no bad tires, tires turning true. Can't believe that a 4700 pound Hummer would be that sensitive to a small trailer.

Second, there were several occasions when I got out of the Hummer, I could smell a lot of fumes like something was burning underneath. This was after driving on dry pavement for about 15 miles. Stopped for gas and the smell was bad.

Not long ago, I was driving in a snowstorm and had the Hummer in 4-high-lock. When driving home on primarily wet pavement (no tire slippage), I forgot to take it out of lock for about ten miles. It was mostly a straight road going about 50 mph. I know you aren't supposed to drive in lock with no slippage but I can't believe 10 miles would destroy anything.

Anyone have any similar experiences or thoughts on this?

f5fstop what do you think?

Thanks.