You can use the 110v migs, but it will require careful prep on heavier frame material. The smaller migs are really sheet metal machines. I had a Lincoln Welpak 100 for many years, finally got tired of finessing to weld the heavier stuff, and stepped up to a good 220v machine capable of 1/2". Save a little more now and get a machine that is rated for heavier material than you are planning on welding. You will not be disappointed. I would stick with Miller or Lincoln if it were my coin.

Keith