1/8 inch 2x2 tubing for a tongue extension

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This website has been a good resourse for me when choosing what wall thickness to use on the rongue extension on my project. http://www.angib.pwp.blueyonder.co.uk/teardrop/tear84.htm. I ended up using 1/4 in wall thickness on my tongue extension. However, the wall thickness is determined by the end weight of your trailer when built.