I read it and understand your frustration. I didn't comment since maryland isn't on my radar. I suppose every state has some quirky laws. Some of them really stick out and show how lobbying pursuades the lawmaking process. I assume it has something to do with being a motor vehicle or something? I doubt if it would slow me down much, at least inside the RV. I rarely pay attention to stupid laws like that and do what I want to do anyway.
It's kind of like a seat belt law. If I want to be a mouron and not wear one, so be it. I'm not endangering anyone else. Yet in Texas, as I'm getting written up for not wearing one in my 7600 lb C-3500, some dude with nothing more than cutoffs with his babe in a bikini, can drive by on their Harley (w/o helmets), and be perfectly legal. Doesn't make a bit of sense. It's nothing more than a "Cash Cow". I'm not condoning not wearing them, and in fact have been wearing one since before they passed the law. Remember when they were stuffed under the seats because nobody was using them?
More closely related is the 3 tier alcohol sales in Texas. It causes us to not be able to purchase wine from retailers, over the internet(However, there are ways). They passed a law that says we can purchase it from a winery, since our wineries can ship outside the state, just not from a retailer. We can't buy hard liquor in a Grocery store, can't take a bottle of wine to a restauraunt if they sell hard liquor. The alcohol wholesaler's lobby is very strong in Texas.