As an "er", I can tell you how much I'd value someone who brought his own tools and had familiarity with and could fix my gear.  If he used his own truck in a pinch and didn't break my gear in stupid ways????  Those kinds of people get nice bonuses.

edit- Unit 2, I might not seem to be saying this, but if your employer wants to buy you a truck and tools to use, go for it.  For your sanity though, just try and have him be clear that they're YOUR tools to use and others aren't "borrowing" them and sabotaging your ability to do a quick and efficient job.  One way or another that'll eventually look bad on you.  If I had to share tools, I'd rather bring my own and lock 'em up.  Oh, and do my best job and hit the boss up for a well-deserved raise after a few months...