The tractor I intended to use as a shunter was the C-125. That's the main worker and won't be going to any shows. Now I made two mistakes when making the hitch.
(1) I should have left mule drive pulleys on. No real need to remove them really and I wouldn't have had to change them over.
(2) I used the C-121 when making the hitch and it fitted grand. Unfortunately, when fitted to the C-125, as the bonnet/hood protrudes further to the front than the earlier C series tractors, it was not long enough.
So a simple mod was made as seen below.
The turf tyres on the C-125 are much better on the gravel, though can slip a bit with two tractors on the trailer. Once the rear wheels are on the concrete all goes well.
Being facing forward I can see clearly down the side of the trailer and if I lean over to my right, I can see the trailer wheels under the trailer. When in position there is just 4" 'tween trailer and the articles stored along that side.
Tractors are loaded ready for a small local shown next Sunday I may attend.