Greetings 2b.

I can relate with your delima. My first reaction, or should I say opinion, is to wait till you get back. The best way to make any program succeed is to be well prepared, planned and practiced. Take the time (car ride) to read up on the best ways to do a CKD. Plan some menus. Decide your workout.
I'm afraid that if you start during this week, you are setting yourself up for failure.
But then again, you may be so determined, that you will MAKE it work for you on the road.
Keep us posted!
Peace,
Brenda