If you lived there before the rule was in place, then what are you supposed to do? I like the "let Rocco and Lefty visit him" route for people like this. I had a lawyer who had his clients come to our condo area and park right in front of my unit- all day and into the night, 7 days a week. I put a note on one the cars that said you are parking illegally and to not do it anymore and he came over the next day and verbally attacked me like the small dog he was. I said you are doing business at your residence and that was against the rules. He said I did like the people who came over as they were a certain race. I stood my ground like you do with all small dogs and refused to be intimidated. He eventually caved and the people stopped visiting and he respected me and we became friendly.
Could you buy a car cover and use it? BTW- remember that many vehicles over XXX gross pounds are "commercial" vehicles according to tax breaks- (which is one reason why so many SUV's were sold) could you use that? The owners of such trucks may be forced to park inside or side with you.