As for a handle, if you have a torch, get a piece of 1” ID pipe, put it in a vice and heat up a 12” piece of 3/8 cold rolled rod at the 3” mark. Stick it in the pipe and bend it to 90 degrees. (Let it cool) then do the other side at 3”. There is a handle. Weld it to the side of your frame. Simple, light and easy.
You have your method, I have mine.... Trailer handle: Weld two pieces of two inch long 2" square tubing to the spine, on top, and just behind the front receiver tube for the first, and about 18" back for the second. Then weld a piece of 1" square-wall (.120) to the top of each of the two short pieces of 2" square-wall. You'll have a handle you can grab with both gloved hands and easily move the trailer. ...
I consider my method simple, light and easy too, although my method doesn't even require a torch, and allows for both a single or double handed grip. Heck, it even allows two people to grab the handle if needed.