Don't go cheap on your trailer! Buy a good used tandem if you have to!
I needed to get my tractor down for service. My buddy loaned me his sweet tilt-bed trailer he bought from a rental company going out of business. At 45mph, it was a load for my 4Runner but we made it the 13.5mi to the service department. Upon arrival, the service manager told me I was using a trailer far in excess of its capacity. Remember the gross weight means the weight of the item you are hauling AND the weight of the trailer!
He got it for $500 and it was great for his little J.D. In fact, this same friend hauled my tractor down from where I bought it to my place for me, about 90mi. Only problem is, my tractor is about 1500lbs over gross for that single axle. And, when I bought my tractor, it had an 800lb roto-tiller on the back! No wonder the tires were hot when we got home! Great trailer. Good size. Just not up to the task. With that experience, I would never buy a single axle trailer myself. What if you upgrade to a larger tractor someday?
Never say never.