...Tough business. Insurance would kill, and the licensing/legal fees could be a bundle.
You'd also need a secure lot and building where to conduct business from.
Go to your bank, secure the loan, go about obtaining the proper licenses, then buy the place and lot. THEN worry about getting trucks. Don't use your private truck...unless you want some gun-wielding crackhead to write down your plate number and pay you and your family a visit.
It's a dangerous job, man. Just start a tow truck company. You're less likely to get shot.