The carmakers dropped all of the mid-sized trucks (except the Tacomas), and the market has always been hot for used ones, except maybe the S-10, it's a Chevy, so . . . .
I looked at used Dakotas a while back and was appalled at the asking prices for a 10-year old truck. The new ones are also huge compared to the older ones, and that includes the Tacomas. They are damn near full-sized now.
PS: my pickup was an 2002 F350 XLT Lariat bought used in '03 with 72k miles on it. But with the 7.3 Powerstroke, that kind of mileage is little more than a break-in mileage. I paid $28k plus my S-10 quad cab.