@WizardQuest , the guy DW fired had been to the Wells residence and therefore knew about the Subaru. His yellow vehicle can be seen in the video of SW dancing in the mud puddle in front of the red barrel. (Either DW or CB said the vehicle belonged to that guy, so i don't know this officially.)
DW had some reason other than "this thing is costing me $600/month" for driving the Subaru. But, it's basically his* car, so i guess he can drive it for any reason he wants so i doubt we will ever get that explained. *I know it is CB's car, but DW is paying for it as far as we know.
I keep thinking one good reason would be if he took the boys to work. But, as far as we know, only H has said that was a thing that happened. CB may have just told H that for reasons of her own that may or may not be relevant to SW's disappearance.
DW's white pick up is just a regular truck, isn't it? It's not extended cab or anything? Just pretty much a typical work truck? There is probably at least one other person working on the subdivision that has a similar truck. So, it looks like the Subaru would really stand out and his pick up would blend in... (Granted, fired guy would easily spot DW's exact truck.)
The only car SW was in as far as we know is CH's. I don't know what year it is or if it can tell anyone about the doors being opened.
However, CH has driven it out of state and she could sell it or junk it if she wanted to. I mean, i don't know that she has any plans to be rid of it, but it's her property. So, if she doesn't want it any more, she doesn't have to keep it. So, i am not holding my breath for that truck to tell us anything.
ETA: although I agree about towing vehicles, they have yard cars and a bus, so all the tow trucks in Hawkins and Sullivan County, scramble! (Hehe) but i don't know if vehicles can be towed if the witnesses tell the cops SW was not in a vehicle, she was in a house.