In Arizona, you pay approx. 1.9% of the base MSRP (MSRP with NO options) for new, current MY vehicles and trucks. Since it's based on the base MSRP, someone who purchases a new Ram Cummins HD (diesel is an option) pays the same amount as someone who purchases a new gasser HD of the same year, make, and model (i.e., 2500 CC SB 4x4 Tradesman gas or diesel---same fee). A truck/vehicle with a base MSRP of $40k will cost you ~$760 for your first year's registration. This particular fee goes down approx. 16% every year.
In addition to the above fee you also have to declare your GVW. 8-10K GVW is approx. $36. From 10,001 to 12k is approx. $60. There's also a fee for diesels and a mandatory commercial fee if the OEM GVWR (different from the declared GVWR) is higher than 10k (both fees are minimal).
