I am reading your responses with interest. I sure get the safety concerns. It seems like a project can never be free no matter how much well organized inventory one has.
If I were to put 6 ply tires (rated at 745 lbs each) I could build the trailer for just under $100. I'll have no problem building a strong frame/bed. Not sure what my springs & axels are rated at. I'l have to do some research.