The general rule is that all parcels existing under a properly recorded covenant must be treated equally. Any restriction must me reasonable (reasonableness determined by looking at the deed, plat, and declairation together). If there is any ambiguity it has been a tradition that the free use of land prevails.
If you ever get into a disagreement, always check to see if there is an agreement to avoid litigation in the recorded declairation and follow it in good faith.
I would check the full covenants in order to see if you have any restrictions. Keep in mind the subdivision is governed by the covenants. If you do not see any restrictions then they shouldn't be restricting you.
I hoestly think you should consult a real estate attorney. It will be money well spent and peace of mind and you can right it off as an expense to your rental income.
Best of luck with HOA.