Probably not, like a lot of things on the server. It wouldn't be high priority. Player inventory is limited in it's weight, but a car could have a bigger inventory size. Think of whatever use you could do with that.
I guess it should be based on how big the vehicles' trunk is, otherwise people would stop buying houses because they are useless if you can put anything you have in the vehicle.
Or we could make it so only SUVs have storage capabilities. So if you buy a SUV, you got something similar to a mobile operations center. But you know SUVs are kinda slow too. And if you buy a Sultan RS, it is a fast vehicle, and making it able to store stuff would be very OP for weed/weapons illegal sales/operations. I know it wouldn't be realistic for a vehicle with a trunk unable to store stuff inside it, but hey we are playing a game which should stay balanced after all.
Sometimes I feel that this server is very underrated.