Collecting back rent after evicting

[Eric E.]

We have rentals in PA and NJ.   Evictions are few and far between, but when we have one, the security deposit is NEVER ENOUGH to cover back rent and damages, the tenants always owe more.     Bad stuff happens to good people, but some of them just want to "stick it to the wealthy landlord".      Has anyone had success with a contingency fee collection agency?   Will they skip trace missing tenants, and file for wage garnishment?    Replies from anyone who has had success would be greatly appreciated.   !!!