miller 251
Longevity 200dx tig. cheaper then a spool gun for the 251
the 211 is a 100amp welder (industry standard is 60% duty cycle IIRC). a bit small for welding to 1/2" axle tubes, the 4in1 bucket looks to be thinner plate so it will probably be fine there. http://www.millerwelds.com/pdf/spec_sheets/DC12-54.pdf
about as big as you can go on single phase is 200amp which is why the miller 200/250/251/252 are so popular