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