I did mine with arc. I have a 200 amp inverter that I used at about 85-100 amps for the chassis tubes and at about 130 ish for the largest job ie rear uprights. I had never welded before, I practiced loads before I started. I have never done mig so don't know which is easier. Mig probably does a neater job, I think arc seems to penetrate better and give a very strong weld.
Enoch
www.deepfolly.co.uk