Chrysler

I have financed a big truck from diamler chrysler turck financial. they are charging me 11% and i really want to negotiate with them to lower the interest rate on my financing. can somebody please guide me how to go about it? i think i have a nice credit report but i havent checked it yet. how can it help?

Is this a commercial or business loan.i asked for rate to be lowered also. they would not so i refinace at a local credit union and lowered my rate from 18 to 13%