First, I am sorry for your loss. Dang, that sucks!
When I had a tandem axle dump trailer I was impressed with how little load was on the tongue. I was also impressed with the suspension and how much smoother it drove over RR tracks and bumps.
So, when I got my Bandit 90 with a single axle, I could feel everything! In fact, there are certain sections of road I have to slow down significantly because I am nervous of something failing.
My dump trailer was 4,500lbs empty. Yes, I know they made the trailer with two axles because I was adding additional weight, but when it was empty, it towed great.
My chipper is 4,600lbs.
The first day I towed the chipper I wondered why they didn't have double axles. I have a 16' chip box so my truck is long. The combination of the single axle chipper and long truck is bad. It makes for a real bumpy ride.
And that bumpy ride is putting additional force at the hitch and chipper connection.
So, where am I going with this? I wonder how much time the tongues of the chippers with a single axle will take that load? It looks like the Morbark wasn't long enough.