I have 2 questions:

[iamdenislara]

If you didn't put anything down to place your order, then I don't see the need to even call them. Once the order has been placed, the dealer won't cancel it. They'll just received it and sell it as a stock unit making more money. It's a win for them, actually.
I'd just leave it as is and you can always change your mind when they call you to pick it up.

I did $500

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[iamdenislara]

I look at it this way, you could just do a smaller down payment so you don't leave your savings empty and just make slightly bigger payments on the truck. You can still finance it for 48 months to get the .9% APR and the extra interest you would pay will be pretty minimal. You would just be making those larger payments on the truck versus putting money in savings between now and next year. That's just my 2 cents, you'd probably regret not buying the truck but it's unlikely you'd regret buying it.

Maybe I'm just being a bad influence here.

I think I like your idea.
I will sell my KIA for around $8,000 use it as down payment and with my 750 credit score maybe I can get 1.96% interest rate for 60 month. I will definitely regret not getting it