An attorney will have to review the original documents to properly advise you regarding this matter. There are limitations regarding the changes that an HOA can make regarding the use of property.
No attorney-client relationship is created by answering questions in this public forum. If you wish to create an attorney-client relationship, you must contact me directly and sign a representation agreement. Answers are provided based on general ideas and an answer specific to your situation would require a review of all documents.
The Board of Directors can only create rules that are reasonable and serve a legitimate business purpose. They cannot create new covenants and can only clarify existing restrictions. I agree that a reading of your governing documents (Declarations, Bylaws and Articles of Incorporation) are necessary to determine of the documents contain any restrictions that could be interpreted to allow for the rule.
You should hire an attorney experienced in condo and homeowner association law. These two areas are very similar in many aspects, but do have some differences. Additionally, over the past ten years, the amount of judge made law on these topics has grown. There was a case a few years back in which an association tried to keep out large SUVs, claiming any vehicle over a certain weight was a commercial vehicle. The case was thrown out and became know as "the Hummer case" because the vehicle that was the subject of the dispute was a Hummer.
This communication is not intended to create an attorney/client relationship. It is always recommended you consult an attorney in person to discuss your case. The Law Offices of Stage & Associates practices state-wide and represents homeowners and community associations. Please visit our website at www.stagelaw.com.