I've been using my 15 year old Miller 210 welder on the bus and it has been great. That said, I wanted to upgrade tech wise to a Miller 215 since it has inverter technology. Anyone have that welder and can shed some light? My current welder can do about 60-70% duty cycle whereas the new one would be somewhere around 20% at 120v and 40% at 220v. I like the new welder for compactness and not needing my bobcat to load it in the bus!