I have a stock 24 valve, slushbucket, 4x4, 98 1/2 - 2500. It does have 285-75-16 tires and a straight pipe. I am wanting to pull a gooseneck and load that weighs in at 9400# total. Overall weight is something like 16,900. Will the automatic handle the load without bombing. I would figure on locking out on big hills or when it seems to be struggling. I live in Okla. and plan on pulling to Laramie Wy. Oo.