Agree with Mike, I would NEVER even think of running any 50/50 Hz transformer type welder from any on the inverter chargers here.
And, it is not clear about the maximum power demands of the welder, but you might well need a large, heavy battery bank to feed a larger welder.
Inverter-welders might not put as much stress on the inverter, as would a low-frequency transformer type welder ...
Engine-driven welders from name-brand suppliers ARE quite robust, portable, and often can supply 120/240 VAC at reasonable power levels, as well.
Just sayin', FWIW, Vic
1. The inverter has both an output neutral and a chassis ground lug: Where should each of these be sent to? 2. How to ground the panels: To trailer frame via racking or trailer frame though combiner ground buss; with ground rod electrode when parked; or all of the above?3. Grounding of the 48 volt battery bank: Trailer frame or ground rod electrode when parked, or both?4. Grounding of the charge controller ground lug: Trailer frame or ground rod electrode when parked, or both?5. Now about the GFCI circuitry: Grounding in load center buss to where? Trailer frame or ground electrode when parked, or both?Again, thanks.