I was watching Episode 6 of Season 10 of the Big Bang Theory. In this episode, Howard tries to convince Bernadette that a minivan is a good idea, and he has one on a 24-hour test-drive from the dealership.
I don't live in the US, but I was able to make a pretty good guess that the minivan was probably a Chrysler (we get Chrysler Grand Voyagers down under) so did some poking around on Google, searching "chrysler minivan rear".
I found this image, which I compared to the rear of the minivan shown in the episode. It is apparently a 2016 Chrysler Town & Country.
The resemblance is quite striking, and the one used in the show probably is indeed the Town & Country. This led me to wonder, how do they do such a good job of masking the make and model?
Do they make a special order from a dealer? Do they use a professional auto detailer? Do they use CGI?
As you can see when comparing the two pictures, the one seen in the show is seemingly not a simple "take the badge off" trick; there is actually a blank badge within a sort of diamond where the Chrysler "wings" would ordinarily be spread. Furthermore, the stock model does not have a raised diamond and has lettering on the metal on the boot.
The practice of concealing automakers in this show, at least, is common, though one could clearly identify Penny's original car as a Volkswagen, and I think Bernadette's car is a Nissan.