sorry to jump on you, but that seems cheap, you are loosing money and at that rate in a year or so you will not only be burnt out but out of funds..
Your making around 7.50-8 per man hour$ after expenses.. Not set in stone, but my landscape professor told me as a base line that $20 per man hour should be a min. (if you are legal that should cover expenses and a 9-10 hourly rate for employee)
If you are just doing it on the weekend, have a normal job and all expenses paid and that is cash then I suppose that is good to have a little extra cash..
Only tip I have is to build up the box on the trailer, and maybe make a temp box on the truck ( like one that slides into the holes at the 4 corners of the bed)