I assume you are talking about a RVIA sticker, all the sticker represents is that a trailer has been built to RVIA standards. You can have a RVIA sticker on a trailer that doesn't have a bathroom, as long as the conversion shop is RVIA certified.

If you are asking what qualifies as a second home for tax purposes, my CPA explained to me if it has a plumbed bathroom then it qualifies as a second home. I found it to be better tax wise if I borrowed the money on a second mortage and just wrote off the interest. That's how I bought my first big trailer back in the late 90's.

Maybe you are talking about the actual license plate as far as that goes I don't know as we don't tag horse trailers here in Kentucky unless they are used as commercial carrier.

Here's some previous information about the certifications and various campground rules. You'll notice that the conversion companies that are certified, have to have trained mechanics that perform to certain standards.

http://www.horsetrailerworld.com/forum/thread-view.asp?threadid=10314&start=1

Yep, they are trained by RVIA, to meet standards put forth by RVIA(Again RVIA is a trade organization). There is no "National Standard" for living quarters, campers, ect. Some states have put up some requirements for campers and in those states (Kentucky is one) campers, not LQ's must have a state inspection sticker to be sold "New".

My take on RVIA is that you have the foxes in charge of the chicken house, let's see here if I want to start a company that makes a better water heater I have to pay to be a member of RVIA, so my water heater can be installed in RV's by a tech that was trained by RVIA, so that the RV will utimately be certified by RVIA, and "nowhere" is it required by a law that I have ever read anywhere that a RVIA sticker is required for anything. Hence TR Arnold inspection stickers are just as valid as a RVIA sticker anywhere you want to take it.

As far as the requirements of a second home, the above post is correct according to my CPA, to qualify as a second home it must have a permanent toilet and 110AC electric.

Actually TR Arnold certification would be closer to a UL listed item. UL doesn't certify the companies or the companies employees they just test the items, or they recommend how to test an item. RVIA would be like a homebuilders association, that trains all the carpenters, eletricians and plumbers, then certifies all the components(light switches, water heaters, ect.) that go into the home, and installs a sign in the yard saying that this house was built in accordance with the homebuilders assciation. RVIA is not responsible if the trailer burns down the first trip, Nor should they be, they are mearly a trade organization that represents/trains people to build/repair RV's. Like I have said many times it's just a racket that people have bought into.

http://en.wikipedia.org/wiki/Underwriters_Laboratories