Do it!

I'm really excited about mine
The rear bar has a 50lb weight limit, and as long as you load your trailer correctly that should never be reached....
In my experience, the weight limits are only suggestions. While I agree that if the trailer is loaded correctly, the load will be centered over the axle. Ideally, this would mean a balanced tongue, which is what I strive for. However, I have had over 50 pounds on the tongue with no negative effects.
One of the nice things about the BAW trailer is that it's modular. You can put the axle in the most appropriate place for what your common load is. Don't get me wrong, it would take some time to move it around, so I wouldn't want to be doing it often, but it can be done.
Because the trailer is modular, I'm waiting for someone to build a double axle design... now that would be cool!
I've also had close to 400 pounds on the trailer with no negative effects. So, again, the weight limits are only suggestions.