I agree. For the price of "high end" harbor freight tools, you can usually buy name brand tools for the same or less money when on sale. And a real name brand tool will last you a lifetime with typical homeowner usage.
I bought a pierce framing nailer when building my shed. The pierce...
Project farm did a comparison on electric power washers. I was surprised at the drastic difference in performance between models. Unfortunately, for the models he tested, performance correlated with price.
OP, curious what you used for the topcoat (polyurathane, polyurea, clear expoxy, etc)?
The site below recommends NAB tire mark remover:
site:https://allgaragefloors.com/tire-marks-epoxy-flooring/
Curious if you considered a floor coating such as epoxy? I'm in the same boat as you with similar requirements and it seems like a floor coating would be a great option, but I have no actual experience with either system.