In Florida, judgment creditors are able to garnish wages of judgment debtors. However, if you are eligible to file Chapter 7 bankruptcy, you may be able to avoid liability for any deficiency.
Before you take any action or make any decisions, you should speak to an attorney who is knowledgable in debt collection and bankruptcy law. The National Association of Consumer Advocates (NACA) is a non-profit consumer advocacy organization. NACA maintains a web site at www.naca.net where it lists geographically consumer law attorneys all over the US. If you don't already have an attorney, please look there for someone in your area who can help you.
Florida law does provide for the ability for a judgment creditor to garnish wages. However, there are exemptions that can be claimed to prevent garnishment in certain situations. Fl. Stat. 222.11 provides that the wages of a "head of a family" cannot be garnished at all if their disposable earnings are less than $500/week, and if the earnings are more than $500/week, garnishment is only possible if the debtor has agreed in writing. The "head of a family" is defined as the person providing more than 1/2 the support of a child or other dependent. As applied to your situation, a judgment against both you and your husband will allow the creditor to garnish the one who earns less per week.
In any event, at a minimum, you must be left with 30 times the federal minimum wage per week after garnishment (see Consumer Credit Protection Act, 15 U.S.C. s. 1673). The maximum they can take is 25% of disposable earnings (earnings after legally required deductions).
BTW, re-negotiating the loan creates a new contract, extending their ability to sue you if you default under the new contract.