You both have a case for something.  He has a right to half the utility bills as agreed (was it orally or in writing) and you have a case for half the costs of the u-haul and other expenses (I am assuming orally).  What you are going to do is to counter-claim - if permitted in small claims court - for the expenses that he was supposed to pay half of.  Bring a detailed accounting and all receipts for the u-haul, etc.  You can even throw in the missed wages, if any, to show the court you lost a days pay as well.  What will happen will be a crap shoot.  No one can tell you for sure.  Now, I am hoping that you are not sharing the storage unit as he seems like a hot headed kind of guy.  That incident I would speak with an attorney about.  Good luck.