Hello jande: I bought the levelers at
http://www.etrailer.com for $16.95 each. good for 1000 pounds each. They were the cheapest I found. I like the panels you used for the inside side walls. I used 1/4" oak plywood for the inside of mine. I like the lighter color wood. You are moving right along... Keep up the good work. Don't rush it now. You will have a great first TD. Wait, you already have a great TD.