Essentially, the issue I’ve found is that people don’t care about things that would disqualify a vehicle from being considered desirable, such as having a top speed of 15mph.
In any year, you can make a cheap, crappy van that’s barely mobile, and people will want it because the only things they are looking at is the reliability, efficiency, and cargo space.
What I did was put a tiny 3-cylinder engine with a redline of 2000 into a giant van with the transmission set up for the highest top speed, and the lowest gear spacing where the van was still mobile.
This makes a vehicle that’s barely mobile, but has a largo cargo volume, reliable engine, and high (100+mpg) efficiency.
It seems like there should be a requirement for vehicles to reach highway speed in order to be desirable.
Also, when I made a van like this in the kee engine version of the game, if you looked under the aerodynamic tab, it would crash the game.