A PIA is only suitable for thos who can meet at least the cost of the PIP plus some level of monthly payments towards their debt. There is no stated minimum income, but at 10K pa you are unlikely to be ina position to meet any realistic monthly repayment.
Banks cannot take assets from you. On foot of a judgement they can get the Sheriff to call out an seize goods, but you are entitled to keep the tools of your trade. Effectively if these vehicles are essential to your business, it is not likely that the sheriff will seize them.