I have a Hummer H3 with the 3.5 I5 Engine and it tows fine. Its not designed to tow huge items but we have towed a 65 Mustang on a trailer before with no problems. I have the Maunal Tranny on my H3 too as well as the upgraded suspension package so I am not sure if that makes a difference.
The aluminum trailer and boxster should be fine though. We traveled a few hundred miles that way when moving a few years ago with the boxster on the aluminum U Haul trailer and it was just fine.
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2006 Hummer H3 - RED 76k mi - LIFTED - 3rd row custom seating on 35's and a manual tranny.
1997 Boxster Guards - RED 86k mi - 19" Lobster Claw Wheels on Conti's , Porsche side decal for extra "speed", manual tranny -signed by Hurley Haywood
Phoenix, Arizona
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