CampCap: Trailer Life usually runs MT attorney ads in the back, but did a quick scan & couldn't find anything. They help you set up as a LLC, a Limited Liability Corp. It's to avoid paying sales taxes. Just another "something" to think about before you decide to go fulltime.
We paid 6% tax on our RV's in FL. The 1999 issue of "Selecting an RV Home Base" says MT has no sales tax, SD is 4%. TX is 6.4%. Am sure figures are somewhat out of date, but if you don't have the 2006 version, I would suggest getting it.
Do a lookup on RV.net. Know you like to spend time there, too.