my last two jobs sounded much like yours, and i tried changing to a different company but it was same shit another place. the fuel costs to and fro were nearly as much i earnt and the wear and tear on my car was a constant expense. the hours were dire.
i count my blessings i got the job i have now even though i fell into it by default, the wages are still low but i dont mind that cos i'm the manager and i'm left to run everything with minimal interference. i also get out of pocket expenses which means i dont have to worry about travel costs so i'm not losing a chunk of my wages.