So, just for shits and giggles, I look up how many used Double (extended) cab or Crew cab 2014-2015 trucks are on the market on Cars.Com . All major brands.
(I weeded out the Regular cabs, since Uhaul and other Fleet buyers blow through a big load of 1/2 ton Regular cabs every year.)
9100 Chevy trucks of various trim levels- either double cab or crew cab (2014-2015)
3700 GMCs either double cab or crew cab (2014-2015)
So that makes 12,800 used Crew or Double cab GM trucks sitting there used because the owner either traded in, lease was done, or whatever......
2014-2015 Super cab or Crew cab Ford F150? Approx 8300 used sitting on lots.
2014-2015 Same thing in a Ram? Approx. 8700
And same flavor in a Toyota? 2000 of them.