I'm going through a tough diesel Ram sell decision also.

My 2004 diesel Ram just turned 160k miles
It's been my daily driver has been flawless the entire time I've owned it.

I have gone out of my way to keep it in excellent conditon mechanically and cosmetically and never modified/bombed it.
I was planning on keeping it forever.

The wifegod isn't as impressed with the truck as it's ride is a little too rough for her and of course the diesel noise and smell.
She also is real impressed with the nice interiors and fancy options in the newer trucks.
We do use the truck often for hauling and towing so she is pushing to replace it.

I recently did some research and was looking at newer 1/2 ton Hemi powered Rams with the 8 speed transmissions.
From what I can tell the newer Hemi Rams should be able to haul my 22' enclosed trailer if they have the tow package.

I only tow the enclosed trailer 3-4 times a year but also tow my boat and open trailer with ATV's and UTV's which also should be no trouble for a newer Hemi Ram.

So I'm checking prices on used diesel Rams.
In my area 4wd is a must and the 2003 to early 2004 HO Rams seem to bring good money.
I would think my truck should be worth $20k if I sell it myself.