Make sure you buy towing insurance. It only costs about $10 / year, and it will save you a lot of money. In fact, I can't figure out how insurance companies can afford to offer this kind of insurance at all.
Last week, I was driving home from the coast when I lost power - the sort of feeling you get when a filter clogs or you run out of fuel - and switching back to the diesel system didn't solve the problem. The truck ended up spending the rest of the weekend in someone's driveway, until I could figure out what my towing insurance covered.
It turns out, that for a measly $5 / 6 months, SafeCo. Insurance will tow you to the nearest towing facility and pick up the bill. I decided to have the truck towed to my house (worked out to be the nearest facility for my repairs) to see if I could solve the problem without incurring additional mechanical expenses. The last thing you want to do is let a auto shop get a hold of your vehicle.
The towing bill came out to be a whopping $123.20. All I had to do was fax them the bill, and I had a reimbursement check within 3 days.
This is the second time I've had a major towing incident with old diesels (the last one cost me $90). Don't go out without towing insurance.