This may be the unit..............good old HF.
$899
I found a $100 off coupon, for $799.
4000 psi with a vario pressure reg on the wand.
https://www.harborfreight.com/4400-psi-42-gpm-13-hp-420cc-commercial-duty-pressure-washer-epa-64931.html
Northern and Northstar are $$$. the next price point seems like Belt driven in the $1600 range.
Costco would have a return policy but may not stock the unit.
Lowes and HDepot about the same.