I'm not sure what's going on here, but shipping from Elk Grove, CA to Idaho wouldn't be too bad, maybe about $1k.
A lot of dealers advertise like this, throwing every possible incentive and rebate on their listings, but $4,000 from the dealer alone is very strong. Dodge incentives are regional- they need your zip code to see what you qualify for.
https://www.elkgrovedodge.net/new-inventory/index.htm?make=Ram