Like everyone has said the inspection sticker has several additional holes popped in it, so that LEO can see it is for a trailer and can't be stuck to a car window.
The small registartion sticker is supposed to go on the lower corner of the trailer license plate.
And for all you New Yorkers who want to save a few $$$. You don't have to register your trailers on Janurary 1st when they come due. New York allows you to wait, without turning in your plates.
So if you are like me and your trailer sits closed up in your back yard from Janurary to mid April, You don't have register it. I do mine, online, at about April 1st and they discount the resitration from the full amount. Its not a true 1/4 off, but it is some.
I have been doing this for years. Saves a few $$.
2013 Rockwood 8281SS 5W, Reese Revolution
2012 Toyta Tundra Crew Max 5.7 4x4, Timbrens