RVDT - Spot on.
side pulling off the belly hook!
Firstly, that looks like the onboard systems swing hook, Which has had no side load testing and is not certified for class C loads.
Futherthrmore, in that configuration if the brake operator stopps suddenly or the wire gets on the axle it would try and roll the helicopter inverted.
Use a heavy weight and the belly hook or a side pull, dont combine the two.