My sympathies to any "dolly" operators. When I operated a Twin Squirrel for a well known UK Retailer we commissioned a dolly to supplement the one man band operation.
My first landing, at night, (downwind Force 6) frightened me S*******S. I decided to couple up my Ford Sierra (1988 - what a year) to the 50mm ball (prime mover) to give me a forward reference.
I used to line up, the right roof gutter with the aerial and it was like shooting fish in a barrel.
It proves you cannot hover by reference to the chin bubble. Some years later I was trying to land G-OITN on the very same dolly. The one on which I had scores of landings. Without the Sierra, or equivalent, it was a nightmare all over again.
One famous dolly incident on the North Sea involved a Bell 212 G-BFER. It became known as "Echo Rollover" - it never flew straight after the rebuild!
Happy Days!
UG