I had one such vehicle which I tried to trade in at the time, but every car which interested us was at least inflated by the $4000 or so which the artificial trade-in value would have gotten us.
Gee, what a coincidence, I thought!
But it did have the effect of pricing those cars higher. The spring after the program ended, I got nearly that by selling the vehicle on Craig's List. The buyer still didn't get a bad deal-- he could see my car was a lot better maintained than the average car of that vintage.
Perhaps this policy of enabling the construction of shelters for temporary classrooms came as part of a waiver of the Davis-Bacon Act. Davis-Bacon mandates that governments pay the going rate for construction, and that has been taken (I believe by statutory amendment, but I’m not sure of that) to require union rates.
This policy would force schools to knock down the shelters, and in order to rebuild them they would have to pay the going union rate for their re-construction.