Trickdog. I just did this replacement in my 2007 Journey this year. I had a "one-box" type DVD Player-Receiver in my unit. After looking at these "one-box" type offerings and the poor ratings they were receiving, not to mention you had to buy all the speakers too which are not needed, I decided to buy a separate receiver and Blu-Ray/DVD Player.
While I did have room for a lot of "footprint" for the recevier (length-width) I did not have a lot of height...and most receivers are pretty high. I purchased the Pioneer Slim Audio & Video Component Receiver Black (VSX-S520). It's only 2 3/4" high. The connections for my surround sound were identical to my old "one-box" system, just plugged my existing wires in. I did have to get an HDMI cable for TV to Receiver as the old system had the 3-wire system. Other inputs just plugged right in. It also supports wireless and 4K/upscaling. Link below so you can see pictures of, including detailed pic of the component connections on the back so you can be sure what can be connected and how.
https://www.amazon.com/Pioneer-Audio...+thin+receiver
You can then purchase the Blu-Ray/DVD player of your choice and connect via an HDMI cable.
The sound is fantastic!
I did use a heavy-duty velco to hold the units firmly to the shelf they are on in my cab overhead compartments so they don't bounce around. So far, so good.