Not ruffled in any way, just more concerned about some safety. Most of the collision training about suspension, repair quality etc, has a strong focus on liabilities for the work/modifications that we do. It's not solely about if we ourselves are safe from liabilities as technicians there is a large emphasis placed on disaster type scenarios. Actually hate being "that guy"I am on the edge of 5400# with passengers, gear, trailer & 3500#. But still under. After having this discussion and researching more the dual axle is probably the way to go. It was honestly my plan originally, it was only after talking to the local trailer place that he said just do a 6 or 7k axle, which is why I was reaching out. I had actually been looking at horse trailers as most of them have dual axle & 2-2.5x the payload of what I got, but most of them were in need of more work than I was willing to do. Also a lot of home built stuff. Most of the ones I looked at were similar construction to what I got, but with either steel or 2x6 floors.
I knew this thread would ruffle a lot of feathers.
Just for reference and food for thought. I had a nephew that killed a drunk woman who jaywalked out into the street between two parallel parked cars in the pouring rain. Slid right over her on the binders he did. Found not guilty in criminal court. This did not stop the mother, father, husband, sister, brother, son, daughter, Aunt, Uncle from suing him one at a time in civil court one by one, one after the other for better then a decade. He couldn't ever escape it. Each new filing by a new party was a new trial. No free lawyer in a non-criminal case. No surprise he took his own life. Not trying to be offensive but there more to than what you think you can get away with. You're not on the road alone. The shortcut is not worth the risk.
From my own research the light duty low capacity box trailers I looked at didn't have much more than 2x2or3 tube frames, the dual axles ones generally had 2x4 or 5 frames, some 2x6 tube. There were lots of price points that directly related to structure. A smokin' deal usually isn't when getting to the nitty-gritty of how it's built. Choose wisely and there is usually some kind of engineering behind capacities etc. We pays our monies and takes our chances. Some don't have much to lose.