If you went to idle at 30-40' in a Cheyenne or a Navajo there's a high probability that they'll have to get a crane to get the plane off the runway.
thats fully correct and because of that i quoted this post previously with a laugh :
16 years flying, pistons, turboprops, medium jets (A320), I don't remember ONCE looking at my speed past the threshold.
I try to fly at Vapp/Vref stable until I hear 30/40 feet, thrust idle, flare and let it sit in the TDZ.
missed again : you have experience on a ( real ) cheyenne III?