If you are using the ladder in a wet environment, you probably want aluminum rolling ladders or stainless. We sell both stainless and aluminum - neither will rust. The next thing to consider is tread type. Serrated steps offers the highest level of traction, followed by perforated, then solid stairs with anti slip strips. Although grip strut (serrated) steps may be $15 or more per step, we suggest this as a good upgrade to any unit. Safety first is our rule. Anything that can be done to make a fall less likely is worth doing.
For convenience, we also sell the stairway ladder. This particular rolling ladder has a 50 degree slope, so the user can walk on it like it were a stairway. Many like these, as the normal method of walking down the ladder facing the top is the reverse of how we normally go down stair - again this is a safety issue that is resolvable for little money. Now that you have chosen the construction, and tread type of your new rolling ladder, the next thing to consider is ladder width.
All things being equal, A Plus Warehouse agrees with the old car advertisement - wider is better. Although all our ladders are OSHA approved for intended use, narrow ladders have an unstable psychological feel to them. We obviously only sell safe equipment, but we suggest keeping narrow aisle rolling ladders to narrow aisles. On many rolling ladders we offer double deep top steps. This is a handy feature as the top step is often used as a work platform.
Your final consideration for a traditional steel rolling ladder or aluminum rolling ladder is the height. In order to calculate the height correctly, consider the ergonomic lift height. You shouldn't have to lift below your knee or above your shoulders. So, add half the height of your average warehouse worker to the top step height, and you will have an approximate working height of the rolling ladder.
There are some other interesting warehouse ladders we sell as well. We sell a crossover which is effectively a warehouse bridge. Lets say you need to walk over a machine in your plant. The crossover has 2 fixed height stair columns - whose top step is above the obstruction, and a joiner piece that allows you to pass over. Crossovers are not typically mobile. Other specialty rolling ladders include 360 degree rotation type with wheels in the center, and tilt and roll that allows you to move the item just like a hand truck.
We have taken steps to minimize damages to our rolling ladders in transit. Packaging is much better than it has ever been, and larger ladders have shipping protection for each step. Our highly qualified sales staff is ready to help with your needs. Our telephone is 800-209-8798.