Jensen is today part of Audiovox which simply means that their car products are far east sourced and nothing to write home about....nor are they the worst. But there's not much left of what made them famous for great car products in the last century.
I sure would keep my car stereo, speakers & dvd player and gps separate from each other if doing it myself. Putting it all in one box just doesn't lead to a quality experience over time. If something breaks, I'd take your unit to someone who makes their living doing car audio/video and get a quality car system with separate RV GPS and DVD player. They'll finish it out right and you'll be happy with each piece of equipment.
2015 Georgetown 280DS
2014 Vespa LX150 2014 StellaAuto 125