I did what BG Smith suggested two years ago when I found a clean used fifth wheel in La Grande, OR for my son-in-law's company and went to pick it up. I took along a TX paper plate purchased the day before I left home and had no problem.
But states other than my home state that issued the temporary plate, TX in my case, may not be obligated to honor the temporary plate. The court house clerk that sold me the paper plate warned me about that factor. She advised that some states will stop you and demand a temporary plate for their state as well. I didn't have that experience so couldn't verify her warning.
Another solution if you don't mind being a little devious is to borrow a NY trailer license plate from another trailer you own or from a friend. Attach the plate to the trailer when you hook up to it and anyone who sees you will figure you're just another RVer on a summer trip. If you are stopped for speeding or an inoperative tail lamp and the officer runs the plate you may have a problem.
In the early '90s I bought an immaculate '87 Avion 32' travel trailer in northern Illinois. I took a TX trailer license plate off another trailer I owned with me. I bought an IL temporary paper plate just to record the title transfer and make the seller happy but at the first truck stop I encountered I put the TX plate on and traveled all over New England before I returned home to TX. Had no problem with the sneaky method.