You got some good advice on price from members above.
I would be most worried about the reliability of used truck of this sort.
There could be issues with hemi engine manifold bolts, lifters, cylinders etc... Or any other things.
I highly recommend you to find a mechanic who you can trust, and who actually works a lot with Ram trucks, and knows their issues, and have that truck checked out well before you buy it, don't do it any other way as you may spend thousands $ fixing all of the bs issues... You don't know anything about that trucks past.
See if your local dealership may be willing to do inspection and check all the common issues, although not sure if you can trust their report but worth talking to them and later talking to tech who inspected your truck, if you can get them to be honest with you, they may be a good bet, I'd use them as second opinion..
Good luck