As per company policy...we are not allowed to perform any company functions before punching in for the day...3 min before your start time or 3 min after. We in Cleveland have several that enjoy doing this(coming in before thir start time...loading their trailer.. hooking up etc) Every supervisor in Cleveland is aware of this going on and choose to look the other way...This one driver opened up another drivers trailer door after his door was closed to hide a pallet jack so he would have one for later...The other driver then departed with his door open and spilled the pallet jack out on the road and almost got fired...received 3 days off. This driver who was on the dock 40 minutes before his start time felt bad and claimed he would never do this again...3 days later he was right back at it. On Tues 7-7-10..this same driver tried to hook up 20 min before his start time...He high hooked the trailer and almost smashed the back of the KW...2 dock guys were summoned to come out and lift the trailer off the tractor....As he was pulling out he almost ran another city guy over...all this when he wasnt even on the clock...This driver is already on the bubble from multiple accidents (2 in one day)and is always in a hurry..Why Why Why is this permitted to go on..I have pointed this guy out several times with no results. Management doesnt give a damn...all about numbers...All i say is this guy better not ever hurt anyone here..Does this happen at other terminals?