Once I had a rough design for my tiny house, I knew about what size trailer I need. The search consisted of Craigslist, newspaper classifieds and checking junk yards for travel trailers. I found a 20 footer and a local junk yard and paid $100. I hauled it home falling apart with some pretend tail lights spray painted on the back bumper. I stripped off the camper, keeping some items, down to the trailer. With the rust cleaned off I applied some rust converter and sprayed Rustoleum Rusty Metal primer on the frame. From there, I reinforced the trailer with angle iron in and around the frame. The frame is now drastically stronger and stiff. The final step was painting, I used Rustoleum Black.