If your gonna do it then take note of what everyone has previously stated with notary(sp) etc. However, due take into consideration that while if they miss a payment you can legally take your vehicle back into your posession, there is no gurentee that it will be in the shape in which you sold it to them in....Basically if they wreck that car they could just stop paying for it and tell you to take it leaving you pretty S.O.L. I mean if this is the case then they probably didn't have insurance or anyway to fix it out right etc so even suing them wouldn't work out all too well...