One of the problems for those who have actually this type of Collateral (and not the type that doesn't and try to scam), is that if they go to a local dealer they ain't going to get
BTC. Instead they will get fiat (taxable) and a contract stating and confirms this Loan Agreement. Thus their Loan will be
noted. Thus goodbye anonymity.
If someone want to use large items as Collateral in order to get a Loan in crypto, this is the way. The only way.
You should disclose your city or at least your country. Only people close to you could grant this loan and they would need to see your car and check everything is fine.