Which dealers help customers who've had their vehicle repossessed?
none if you have the car repo ed then I'm surethe dealership knows. if you are looking to get another car and you have had one previously repoed then you might be poop out of luck because this effects your credit and it shows on the credit report what the problems is and in most cases shows a repo. depending on how long it was ago. they only really hold information against you for 5 to 7 years.
Some of the little used car lots will sell you a car, but you need to figure out which ones will do that. Look around in the area where you live.
There are some sub-prime lenders out there who will take a chance on financing people with repos on their record. How long has it been since it happened? (They are generally off of your credit report in 5-7 years). Expect higher interest rates with these lenders (or the "special financing depts" of a large dealership). In some cases, as high as 24-25%.