You missed the greatest advantage to an LLC, and that is Montana does not charge sales tax on a motorhome purchase when owned by an LLC. You can still transfer your m/h to an LLC on MT, I would guess $1000 up front to form an LLC, annual registration around $400, plus annual fees for the LLC to be $150... all based on my experience. Contact some MT law firms and then crunch the ##. If you own property in another state that does not charge an annual tax, you may be able to title your m/h in that state. Not a lawyer, just my experience.
Kent & Sue & Pecos
2010 Allegro Bus 43QRP
Formerly 2004 Itasca Horizon 40AD