Thank you for your question. I look forward to working with you to provide you the information you are seeking for educational purposes only.
If the HOA is a mandatory HOA, the only way out of it is to sell your home I am afraid. When people buy a home in an HOA, they agree to be bound by the bylaws and rules of the HOA, it is a binding contract under law. MN law allows HOA to set their own rules in their bylaws and this makes an HOA unattractive to a homeowner
who wants uncontrolled freedom in what they do with the property they own. If a homeowner does not mind strict regulation and being told what to do with property they own in exchange from all others in the neighborhood doing the same to try to keep their property values high, then that is the benefit.
If your trailer or vehicle does not violate the bylaw, they cannot enforce it and you have a right to appeal to the board and cite the bylaw as well as provide proof that your trailer does not violate that bylaw.
The only way a homeowner can beat the HOA is with the bylaws and covenants because the HOA can only enforce what is in those bylaws and covenants. You as a homeowner can appeal any action that is not prohibited by the bylaws and if the HOA persists, then you can sue for a declaratory judgment in court to get a court order that you are not in violation and for them to cease and desist harassing you on that issue.
If the wood pile is neatly stacked and covered, it is not refuse and would not be within the bylaw prohibitions and if they try to remove it again you would have grounds to sue them for damages
for acting contrary to the bylaws and seek damages against them.
The rights of you as a homeowner in the HOA are in your bylaws, so you need to use those bylaws word for word against them and make them adhere to them.