In London, England, where the roads are narrow, the parking spaces are limited and we have plenty of availability of vans that can actually fit things in, we still get these a*holes with their unnecessary large pick up trucks made for a road system completely different to ours…
These spaces are wider than usual and long enough to fit them but they still have to park like w*nkers blocking the only footpath around!
I mean, I have a 5 door hatchback and know that my car overhangs the back wheels, as does any primary school kid drawing a car…
Check local laws about blocking sidewalks. You may be able to report them to a parking authority. Also, it may be illegal to have a hitch like that on the back while not actively towing (in some states in the USA it is).