Marcio, I like it that you brought that up. Indeed a car can be thought as more basic "mais basico" than the other, that would be a comparison made by degrees (from the entry-level model). But it would be more about the hierarchy of consumer, levels of consumer experience (sort of) than about a car being stripped down car (um carro pelado/básico [sem muitos acessórios opcionais, etc]).
With "a stripped down" car you compare it with or without such acessories, with a trim level you have a "new type of" car, sort of".
I explain, a car of same make and model would have more features added when added trim levels. Let´s pick a "Corsa" (Brazilian car - Opel, European way). Let´s say, the Corsa of a given year of fabrication (model year - take 2002-2012 for illustration´s sake) is a Hatch VHC, then it´s the basic model (entry-level).
Then comes the Hatch Joy, the Maxx, the Premium, and so on.
In the same vein, if a Honda car in the U.S. Is EX, it will be of a higher trim than a LX. And a car of Chevrolet make with a trim level of LTZ will be higher than the LS.https://www.edmunds.com/car-buying/trim-levels-101.html