That's way too long of a trip with a trailer that has no brakes. You mentioned that you have access to it, which tells me that it's not yours, and that you're probably not used to pulling it. You could very easily find yourself in serious trouble, if you got into a panic stop situation, for example.
My trailer had no brakes for many years, and I did a lot of hauling with it. But I knew what I had, and drove it accordingly. Still, I realized I was taking a chance, every time I left the yard with it.
I'd never have taken it on the trip you're describing.
