I would look into the new Chrysler Pacifica. The "experts" are very impressed with it at the Auto shows.
My 2003 Chrysler Town and Country is still going strong, and still has the original trans. I just turned 200,000 miles about a week ago.
We do not want a separate router and modem. We also want it to be able to stream 4k video in the future. What specs should we look for?
This will be used with TWC(EarthLink) broadband internet. The link below lists their approved modem/router combo units...
I don't know about the current receivers, but I have had a cheap Marantz stereo receiver in my unheated garage for about 20 years with no problems. And I'm sure the winters here are even colder than by you.