The 7x16 should have just about twice the tongue weight .
So , it's understandable that the job would be a little more tedious . LOL
Pete .
That and the dual axle makes it harder to turn.
I bench tested it with my battery charger, looks like it’s a winner. When the temperature gets warmer, I’ll get the battery and test it on the trailer.
Just as an aside, the 2 wheels in the middle are powered, while the 2 on the outside freewheel. This should make it turn easily and provide nice floatation on softer ground.