Bruce, our 2004 Journey cracked a windshield at the top. Once it started it keep on expanding. I am thinking you will want to have it repaired before you start across country.
The link below is to my post in this forum that discusses the event and on page 2 of the post I showed photos. The Journey has a metal frame which rusts and this expansion causes cracks. The mechanic who repaired our windshield ground down the rust and uses a special paint that helps prevent rust as well as allow the windshield sealant to work.
Our Insurance company put us in touch with RV Glass who subcontracted to a company here in the mid part of Florida called D & K Enterprises. They did a great job and I've had no issues since the installation.
First Cracked Windshield