Digital copying of dvd's does not degrade the resolution of your material (bit for bit copy as long as your burner is ok) Don't store your dvd's in a hot car. Heat and plastics is not a good mixture. Store them in an insulated six pack bag. They should stay safe there for several hours. Have a good trip.
I have two questions that maybe someone can answer.
1. If I copy a DVD that I made from a vhs tape onto another DVD, will the copy be exactly as the original with no loss of quality?
2. I am planning to drive across country in a few weeks and want to take some of the DVD'S that I copied from VHS tapes. Will the change in temperatures in the car damage the DVD'S in anyway? Say I have to leave them in a hot car for a few hours while I eat.