be tricky. Don't be afraid to put things on them; if they worked once, you know that they can be adjusted if they ever need it again. Strangely enough, mine worked better when I had my canisters on one and some appliances on the other. I thought maybe I was overloading the weight limit, so I changed cabinets with lighter things that I don't use as often, and wouldn't you know, I think they worked better when the heavier things were on them.