I have done many of dog transports, some are all day drives lasting days at a time. Each dog is different, but typically for a puppy I plan for potty breaks every few hours. As others have mentioned off the beaten path areas are great, just keep a close eye on him/her to make sure he is stying out of trouble. I will take some food with me, but do not feed a full meal. I will hand feed single bites of kibble (for multiple reasons...I do not want to cause motion sickness, and I am starting to create a bond with this baby that is going through a move, which can be stressful) Make sure you take plenty of water, but you can also regulate the amount you are giving. You want to make sure the dog has plenty of water, but not 'hurting' to go potty before you can get 10miles down the road.
As for the crates...The set up you have pictured looks great. I am not sure the temporary fix will work for more than a week or so. I also temporarily house many different dogs and they all stay in kennels throughout the house. Some in my room and some not, usually the noisy puppies are downstairs within hearing distance. Either way is effective, it comes down to preference. I would highly recommend a kennel if you choose to utilize your bedroom. Garage sales, wal-mart, craigs list, all great resources.