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The Hummer Knowledge Base
by Tom Fritz
Use a bolt -> washer -> material (plywood / boat deck / what ever) -> cross bar -> washer -> nut.
I wish I had got the nylon lock nuts, and if I ever take it off, I will use them.
It is helpful to have someone with small hands and arms to hold the nuts while bolting the unit to the rack.
Heat savings... should be very close to parking it under a tree.
Please use the oversized washers for better support in the material, and to cross the gap in the cross members of the roof rack.
The boat deck material that I chose, I do not need the metal runners anymore. I have left them on because I am too lazy to remove them, since I just put them back on a few days ago!
Unknowns... I do not know anything about air flow, but I do not think there is going to be a problem with flight! :)
To keep the materal from vibrating too much, get 90 feet of rubber insulation used to keep the wind / rain out of your car. Cost: $35
The boat deck stuff has been tested at speeds of 90 MPH, with no visible cracks in the materal or flight. It seems to work very well.
Also plywood would be a cheaper solution and might cost only $40.00 for the plywood materal. I would suggest that the plywood be painted white or a color that matches their Hummer. The plywood ends should have a very heavy coating of paint for protection.
If they choose to paint the wood, then once a year, they will have to repaint the wood. If the wood is left unpainted, rain will warp the wood.
Another solution for the plywood would be to rubber coat it. A long time ago, I found plastic in a can. It was to be used to coat tools for protection from rust. If someone could find a source for that, then plywood would be a great option.
Adding the heat shield to your Hummer also gives you several other uses for your top:
Center = on the AUX AC UNIT
Basic Information with heat shield on:
Basic Information with heat shield off:
This data does not take into account the savings of temp using the vent systems for the 1997 Hummers and the retro "kits" for the 1996.
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