We land our AS350/AS355 on the Trolly/Dolly. Granted it takes a bit more caution then it does landing on a pad alone (which we do also) but with a self brief before parking it seems to help.
I and the other pilots here use the chin bubble and the mirror to confirm where we are placed on it as we are landing.
In my mind there is not a lot of differance to landing on a trolly/Dolly then there is doing a toe in/pinnacle landing/ hover exit etc etc. Care has to be taken in all aspects of these operations.
About the pilot involved....good Kiwi (Toyota) expression comes to me..
Bugger me! Chin up buddy, **** happens.
Hughesy