Here is a quick hack on buying tubing for your Trailer No Weld Racks. Depending on how your supplier sells the steel, you can save money.
We just did a write up of the No Weld Camping Trailer Racks DIY instructional overview. Check it out if its right for your project.
Jeep Style Dinoot Trailers
Top-Tent Roof Top Tents and Accessories
Tventuring Trailer Forum