Stewart, Im beginning to worry about you friend. There are multiple things that can go wrong if you look for them. Dont worry about it, it will be ok. For larger cash transactions, most banks can do a wire transfer straight from your account to theirs and vise-versa. Like cc145a said, most insurance companies have a grace period on coverage. With our insurance company, we can call, give a serial number, and within a few minutes have insurance, and an insurance card in an e-mail waiting at home to print off, or print off anywhere you can access a computer. In Texas, you cannot get tags, or registation unless you show proof of insurance. If your insurance wont back you up long enough to get the vehicle home, you need another insurance company.
Ill be honest, I trailer most of the trucks and cars I buy. Not because they wont drive, but because that way I dont have to try to figure how to get two vehicles back (mine and the new purchase) Plus, the way my trucks are insured, anything that is on my trailer that is attatched to my truck is fully covered.