Good afternoon and welcome,

I agree with Midwest Michael as to expected condition of your rental car and of the wisdom of taking water with you. And he's right about Interstate 15 travel between the LA area and Las Vegas--you will have lots of company.

The one issue I was unprepared for on my first trip between Las Vegas and LA was the mountains: There are 3 or 4 fairly high summits to cross between Barstow, CA and Las Vegas. Close to Barstow, the elevations are fairly low, but there are places where the highway goes through a pass at over 4,000' between there and Las Vegas. Even with the added mountains, the drive is a beautiful one and Interstate 15 is very well constructed and maintained. You will enjoy the trip.

Foy