Fred, you are correct that the TruckPort is being manufactured for us by Sandia. They make good machines. But it's not the model that you mentioned. The model you mentioned is not equipped with the HiFLow vac motors that the TruckPort has, and doesn't have as much waterlift.
Willy, there's always going to be limitations with how much power can be pulled from a wall. No portable will ever be able to equal what a combustion engine can produce - parallel, series, 2-stage, 3-stage, whatever - it can't compare. The TruckPort machine is being positioned as a good portable alternative... It's a well endowed portable that can be used in addition to, or in some case in place of, the truckmount (as referenced in the article). It's simply a hi-performance portable, that's well built, at a fair price. Is it gonna bring world peace or end global hunger? I don''t think so.