If your truck is pristine condition as you allude to, it will fetch top dollar and comparable 3/4T gassers are not that much more $.
Trouble is we just spent a couple months shopping for an older car. Wanted a little rice box car 10-15 yrs old, under 100k and not a salvage, rebuilt, new engine, scuzzy used car dealer special. It took 2 months of constant searching before I found one and several failed attempts and ended up being at the top of our allowance to get one.
Once you get down into the bottom of the depreciation curve, most used vehicles have some "issues." I think I learned just how few people give a schitt about taking care of their vehicles. Hadn't shopped for an old used car in a long time.
So, be patient, start looking for trucks, buy the right one when you find it and you'll have no trouble unloading your 150 afterwards.
2016 Ram 2500, MotorOps.ca EFIlive tuned, 5โ turbo back, 6" lift on 37s
2017 Heartland Torque T29 - Sold.
Couple of Arctic Fox TCs - Sold