car4loan.mobi
Names with numbers that stand for letters (4, 1, etc.) don't usually sell for big bucks, and this will be no exception. Some big TLDs are available (.com taken), and even a Google search for "car for loan", without the 4, doesn't bring up much results. Unless the car loan / mobi business picks up in the next little while, this domain doesn't hold much value.
Low XX
carmortgage.mobi
This one is a little better, however I don't think that mobile phone users will see the need to mortgage cars (or get info on car mortgages) anytime soon. On the bright side though, both of these domains have good advertising keywords, and this one has some Google results going for it. Some major TLDs are available, but the .com/.net/.org are taken. Try to seek out an end user for this one.
Low XX - Mid XX, higher for end user