Hello.
I had seen this car in several movies,& tv shows.Unfortunately I can't remember the names of those shows/movies.

This car appeared in several shows/movies back in 1990s.
It looks like a relatively long,low to the ground,silver sports car.It has only two front seats.The back is flat,& attached to the back is a trailer.
The trailer is also silver in color,& was used as a mobile science/research lab.

Does anybody have any idea what car I'm talking about?

Maybe it's this thing? Your post rang a bell, and I think it's this this I was thinking about:
https://www.imcdb.org/vehicles_make-Steinwinter_model-Commercial+Motor+Vehicle.html ?

Hello Sandie.
Yes,yes it is.
I was thinking of a slightly different model that didn't have that black top.(Maybe they just modified it a bit for some movie/show.)
Still,without a doubt it's the one I was thinking about.
THANK YOU VERY MUCH!