Work trucks squeeze owners out because the rule isn’t enforced
The governing documents already settled this. The board just stopped enforcing it.
The Master Deed restricts what can park in 3920’s parking spaces. Trucks and commercial vehicles need the board’s written permission:
“(1) The Parking Spaces may be used only for parking of private automobiles, motorcycles, and noncommercial vans recreational vehicles for the personal use of Unit Owners entitled to use their designated Parking Space. No trucks, boats, trailers (whether capable of independent operations or attached to an automobile or other vehicle), commercial vehicles, and the like, may be parked in any Parking Spaces except with the written consent of the Trustees. Only one vehicle is allowed in each Parking Space.”
— Master Deed, Mystic River Park Condominium, Paragraph (11) “Restrictions on Use,” subparagraph (A)(1), printed page 9 (PDF page 14).

The board stopped requiring that written permission. Now it is a free-for-all: whatever commercial vehicle your neighbor parks next to you, you have to deal with it. The result: lots of work trucks come in, and owners get squeezed in their own spaces, parked next to large trucks and unable to get in and out of their spaces as easily.
These are not plumbers on a service call. Renters, and likely some owners, now park their own large commercial trucks here every day.
That rule was put there years ago for a reason: to prevent exactly this.
It isn’t an isolated lapse. There is such disarray that even smaller, routine covenants aren’t enforced. Nobody asks for the Trustees’ consent. The board doesn’t require waivers.
Caveat emptor.