Get the pull-behind generator/welder rig ready. Did I get the false impression that testing was to be at a US facility? If it is, then no clearing of customs, not as long a drive, only a pissed off motel manager at the welding/grinding in the parking lot (and import pricing on that Canadian beer) - plus the unit will be quickly deliverable to the US Intertek facility.
Hope you have a gas welding rig, remember you can't take a power cord across the border.... if not, add a couple of months for WDRP to locate a cord for your machine.... then they may have to send the cord or your welding machine out for calibration. Heck you may need to sign a short term lease on an apartment while waiting to retro-fitt the box haha.