The proof of the difficulty in the second installment of car loan can be written as follows: Dear loan department: I am a car loan customer of your bank, and my loan account number is XXXXXXXXX. I couldn't repay the loan on time on the repayment date of XX, XX, XXXX, because I recently encountered some urgent economic difficulties, which made me unable to repay the loan on time. The details are as follows:

1. I have spent a lot recently due to family illness and other reasons, which leads to the contradiction between income and expenditure, and I can't repay the car loan as scheduled.

2. I have tried my best to reduce expenses, but due to the great economic pressure, I still can't pay off the loan within the specified time. Based on the above reasons, I ask for your understanding and support, and hope that your bank can give me a certain grace period or provide other repayment arrangements so that I can repay the loan in time. If you need to provide more detailed proof materials, please let me know, and I will provide relevant materials in time. I am responsible for my repayment obligations, and I will do everything I can to repay the loan as soon as possible and restore a good credit record. If you have any questions or questions about this, please feel free to contact me. Thank you for your understanding and support. Hereby, salute! XXX