Quoted from flynnibus:On the downward trip... remember you don't have to find the perfect clearance either.. the truck will kind of scoot itself forward if you were too far back. You can play it conservative and worst case it doesn't go over the edge.. just reverse and try again. The hardest part is just getting used to the weight shift as the lifters kick in. Holding it back as it lunges a bit.
It is just a confidence thing... but you do have pretty good margins of error. The weight shift is the one that doesn't have many 'undo' opportunities
Escalera does sell brakes that will stop the dolly at the right spot while preventing it from going over the edge. The kit is expensive. They call it the "Step Edge Detection System". Part# SED-1. It's 360$.
I considered ordering it but after some experience with it I'm not really worried anymore. The only time I missed a step was the first time I used it. The last 2 steps went by themselves with the dolly just bouncing of the steps. Thank goodness it didn't happen at the top cause there was no way I could stop it I was barely hanging on for the ride.. Not a pleasant experience. I was tilting the dolly too far back and that's why that happened. It was my NIB JPLE..
As has been mentioned above the biggest "challenge" is the weight shift. Regular weighted pinballs aren't much of a problem. Because it's crazy heavy, I did find WOZ challenging and had a spotter there to help with the weight shift. Otherwise I move my machines alone up and down the stairs.