If this machine is strictly for portable use I would by an engine driven unit.
If your work trucks are primarily diesel then buy an diesel. Top into your fuel line that way you have unlimited fuel supply.
Since your going to use this both at your shop and the field; (This is the way I would go.) Get yourself a long SO cord and plug in to the job sites spider box. All job sites have single and 3 phase power available.
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67 RS/SS
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