No cracking down on LLC. When state legislation allows establishing an LLC in Montana or some other state, and the same legislation doesn't require the members of such newly established LLC company to be US residents, then there is nothing to crack. The rig is owned by LLC, a sort of mini-corporation. LLC is legal resident of the state - not physical persons who established the company and became members. Members, naturally, are allowed to use the company assets. All legal.
However, there is a cracking on fake residential addresses of physical persons in some states. I've been told that Oregon is one of them - better local tax treatment perhaps, don't know. They crack on both Americans and Canadians who register their vehicles in Or without actually residing there. Any moment any state may crack down on such a physical person, like on a camp in Florida - because snowbirds are not US residents. But, local authorities often don't care (or prefer not to care because snowbirds are a source of income for the state).
Homefor2 - yes, if you plan on bringing it to Canada, you better go through the process of importing (or buy locally). There was very good thread on Airstream forum. Rigs newer than 15 years need to be inspected by people from some federal Canadian office - you will get the appointment date and place when you cross the border, often the inspection takes place in Canadian Tire. You will need some paper called "manufacturer's recall letter" (? not sure), and the title from the seller, nothing else I think. If you don't pass the inspection - say, something serious like bent frame - you can't register it and have to remove it from Canada or destroy. It might be cheaper to buy new in the US than used one in Canada, new rig will likely pass the inspection. Rigs over 15 years don't require inspection. Either way, with or without inspection, you'll have to pay GST/PST or HST, same as if you bought it in Canada.
