Read the reviews!! The biggest challenge with this product is it's with is just slightly too wide for 11-in cabinets. My RV cabinets are 13 in wide on the inside but on the 11 inches on the exit so I had to make modifications to allow these trays to pull in and out. Most people don't want to do that kind of work or cut up the trim around their trailer and I don't blame them, but I like functionality which is the whole point of this product so it was worth it to me to spend a few hours on. To install these I replaced the very flimsy shelves the trailer came with with bookshelf shelves from an old cheap bookshelf we were throwing out. I had read the reviews before I purchased the product so I was aware that it was slightly wider than my cabinets and I was prepared to make the modifications required for this product to expand and retract. If you are not willing to make those modifications do not purchase for a cabinet with only an 11-in width opening.