JohnW,
There is a small firm in the UK that builds the best machine I have seen for moving helicopters. The real beauty of the thing is it can handle many different types of aircraft without having to make major alterations.
London Helicopters at Redhill have one of the machines.
The interesting side of the machine is the inventor came up with the idea while fighting cancer.....the company is named TLC....for Ted's Last Chance as I recall.
Someone in the UK will have his contact information I am sure.
Do not buy a machine until you look at Ted's.
Cheers,
Sasless