I started to design a trailer. Here are a few ideas:
My plans had a roll off table That rolled over the welder when not in use. This provided an additional cover to keep rain off. The welder controls could be accessed with the table on the trailer.
The trailer also had a long slim table over eash side covering the fenders. One side was set up to hold a chop saw and with rollers at the same heigth as the saw vise. It also had a small air compressor and an air tank mounted at the hitch tongue.
The welder I wanted was a Miller Bobcat so it would have plenty of power.
Check out Miller's website project area.