Do yourself a favor and stop doing dealership tire rotations. Highly recommend you go to Discount Tire / American Tire and get their Lifetime Rotation package. Also get road hazard certificates as well while you are at it. You can get this package regardless of where you got your tires originally.
For $140, I have lifetime rotate & balance (the dealership typically doesn't even do a balance) along with a road hazard warranty on my tires. That means if any of my tires cannot be fixed, they will replace them. When you consider the cost of one 33" Goodyear Duratrac is nearly $300 installed with tax. You do the math on how good of a value this plan is.
Heck, after 3 dealership rotations, the package already pays for itself!
On a side note, I won't let the dealership do an oil change on my truck, simply because I don't trust them to do it as well as me. Cost isn't my primary concern with doing oil changes myself, but it is a big plus. My cost is about $60 in oil and filter, using Shell Rotella Gas Truck synthetic and the OEM Mopar filter.