Getting New Roo - Need Advice

After finding out my "roo" is in fact a pullet, I've decided to get an actual rooster to help keep my feisty flock in line. I found one on Craigslist listed as an Ameraucana cross (EE right?). I made an appointment to see him tomorrow morning. I found an old rabbit cage that will have to do for his sleeping quarters until he passes his quarantine period. The last time I had to quarantine new chickens was in August, so the weather wasn't an issue. With the cold weather setting in, will he be ok overnight by himself? I think I'm going to house his cage in my garage. Should I cover it with a blanket, or even put him in the back of my SUV? I don't want him to get too cold out there by himself! Also, is there anything that I should do to help relieve some of the stress of moving and quaratine? Should I put some Poly-vi-sol in his water? I even thought of asking the owner if he has a "girlfriend" for sale to help keep him company. Any advice you have is greatly appreciated. Thank you!