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well, you could make your own, but it would probably get pricey. you would need to find the switches and relays off one of the cars that do it, then wire it up to make it work with your truck.
you could make a relay pack to do it without the safty switch, but I am not thinking thats a good idea.
Scroll down and look at the window control module. I believe you need a Viper alarm for that to work though as it is an add-on module. I'm sure other companies make things like that.