Welcome to the forum, Coolbannana, I too am a light weight teardrop builder, and I have a 40 inch by 72 inch teardrop that only weighs 245 lbs, so it can be done. Most of my weight was in the trailer frame, and your frame may also be the heaviest part ot your tear. 1/4 inch walls and 1/8 inch roof is what I used as well. I trust you plan to have trailer brakes on your build, as heavy breaking with your cycle may pose a problem without them. Check the board for added info, I am sure there are quite a few who tow with a cycle. Good luck on your build, remember, we answer all questions. Pics, we love pics.

Roly, the So Cal woody guy.