We use CPI and I would recommend adding the premium to the loan balance and then either amoritizing the premium over the life of the loan OR amortizing over the life of the premium. Do not leave the premium till the end of the loan, I have seen numerous instances where the customer refuses to pay the premium from three years ago. In these cases the premium owed might be more than the value of the car and the bank winds up charging off the premium. In addition to the letters & requests to the borrower about obtaining the insurance, I would recommend calling the customer before the insurance is in place. Bottom line all you're trying to do is get the insurance, once the policy is issued, problems increase. I do think this is a good product because only those individuals not having insurance pay. The 98% of customers that have insurance don't pay.
_________________________
...but I saved a lot on my auto insurance