From about April-August dealerships were calling me offering "buy backs" on my '06 & '07 rigs, claiming they couldn't keep their used truck lot stocked 'cuz sales was so good.
'06 has 5k miles, always garaged.
'07, 20k miles also garaged.
When it got down to money their "best offer" was NADA dealer wholesale, a ridiculously small figure compared to new cost.
So, in these economic times, once you find private owned rig you like, dealer wholesale + a bit is a competitive fair offer if owner HAS to move the rig.