I agree with this post on all of it. In addition to the Mark Dodge dealership, the Dennis Dillon, Dave Smith and Granger Motors dealerships are also heavies when it comes to huge volume so you may want to check them out as well if you can get there or ship it if the deal is good enough.
The difference between the lease vs. 60m 0% purchase payment can be almost double depending on the deal, and again the question is how long will you keep/need the truck and also how hard you will be on it. If you use it like an actual truck it may be hard to avoid costs when you turn it in on a lease if it has “truck” wear and tear.
@garronte - here are some recent lease data points on a Ram 1500:
As for a Tundra, again check out a lease with @Jrouleau426: