I am planning on building a stand up teardrop shape trailer this summer. I traded for a dual axle boat trailer because of my very tight budget. I plan on hauling a lot of 70" long pieces of wood in the trailer so I think the axle spacing actually works better with a boat trailer instead of a dual axle utility trailer. I bought some angle iron and watched a youtube video on welding. My only experience welding was with a stick welder in a high school shop class 20 years ago. This was my first time using a wire feed welder. I think I figured it out and did OK.
Not all of the welds looked this good but they are all solid.
I made a 13' long and 75" wide flat frame. It's ready for paint and deck boards now.