Bernie and Aaron - Boy did I miss that one! I should have said 8 cylinders, or a diesel engine!

I have an 8-cylinder diesel in my bucket truck though, so you'll have to forgive my mistake.
Skyco - I appreciate the clarification regarding the allowable weight to be towed relative to that of the tow vehicle. I was unaware of that important stipulation.
I
think that I'm still legal with my aluminum trailer, but it would be harder to stay within the laws with a steel trailer. Its own weight, combined with a
BX2350 or
BX2230, might put it over the 40% mark. And you could forget hauling a
BX23 with its BH on anything but dual axles in almost any case.
My Avalanche's GVWR is 7000 lbs, so my max tow weight is 2800 lbs on a single axle, no brakes. The trailer, while solidly built, is significantly lighter than steel trailers. But I bought it specifically for hauling the tractor.
I'm probably close to the max. Either way, I feel comfortable because of the weight of the truck. Would I prefer a dual axle? Heck yes. Is it safer? Certainly.
However, I use it only twice a year at the most for hauling the tractor, and therefore can't justify the extra aggravation of a bigger trailer for everything else I use it for. But with the economy the way it is, I've noticed some pretty attractive deals on a few dual axle aluminum trailers...
Jesse