Welcome to the forum. It's a 15 yr old thread, you may have better luck starting a new discussion. I'm assuming the company isn't around anymore or you would have already called them, may just have to pull them at the end of the day.

 

If you can't find the bearing info anywhere you will have to pull them Like Roadie 13 said.

I had a 2001 Motorvation trailer and when i bought it used I inspected the bearings .I dont know if they were the original but they looked good.
I repacked and replaced the seals and towed it not losing sleep over having a spare set of bearings.