Don't do it! True story. I bought my 23LSV used in 08. It was an 07 and sold to me as a demo deal by the company. The trailer is also an 07 made by Extreme. I havn't had any issues until this...
On my way back from Lake Mojave / Laughlin to home about 2 months ago, I was driving on the I-40 between Needles and Barstow. This is a 2 to 3 hour stretch of desert with ABSOLUTELY nothing between the towns. I blew one of trailer's tires and pulled over. I changed that tire with my spare, which had been on the trailer for the past couple years. Within one mile the spare blew. Luckily Boat US found me a tire company out of Needles, and after 3 hours, the tire truck arrived. Another hour to change the tire and such, and I was on my way again. 4 hours on the shoulder of I-40 between Needles and Barstow and I had a 1 year old and a 3 year old in the car!!!! HELL!!!!!!
The tire guy showed me how to read the date my tire was made from the side of the tire. It turns out all of my tires, including the spare, were made mid 2004! Being a tire guy out of Needles, he said he's seen this plenty of times before. He explained its common for the trailer companies to buy a very large bulk order of tires when a good deal comes around, and then let them sit in storage containers until its time to put them on a trailer, and ship them off to the boat builders. This was obviously what happened here. In his opinion trailer tires generally only last for 5 years on average. I don't know about that one way or another, but I got screwed on this trip. That week I bought all new tires which just reminded me of the old B.O.A.T. saying.
Get a good and new spare tire. Blowing the spare is a nightmare, and you would kick yourself in the arse if you knowing bought an old cheap one. Hope this story was useful.