I think the spanner (or wrench if you prefer) should be re-added; 99% of the time there is no damned tow driver on the server, and when there is one it's to tow his friends' cars and then he goes civvies again!
Right now I'm having to walk to subs because some twat totalled my van with an AK clip and no-one is willing to go (a somewhat boring) tow driver. Bringing the Spanner back won't diminish RP as there is usually no RP to do with tow-trucks to begin with!
Say the most expensive car to repair is 5k, either have the spanner 6k or cheaper and REALLY slow at repairing.