Your heads in the right place, you have a goal, don't let anything get in your way.
Good Job on the theater department score! I think if you went to the head of janitorial/maintenance and told them that you were starting a scrap hauling and recycling business, and that you would be happy to clean out the accumulation in the basement, they'd take you up on it.
With your next load, go to vista print (Unless you have a vocational printing department at your school) and order some free business cards, and some magnets for your truck.
Since your truck is paid for, and you have some roommates that pay quite a bunch of your expenses ;) I recommend you continue to reinvest in your business, and you'll be amazed at how it continues to flourish! Looking legit on the street will have people stopping you as you curb shop to offer you goodies!