南非采购需求：铝合金梯子，易折叠轻型铝制梯子，折叠梯，梯子，多用途折叠梯，战术梯

I'm interested in sourcing a foldable and lightweight aluminum step ladder for a project. Key features I'm looking for include durability, ease of use, and portability. Specifically, it should be designed to support a significant amount of weight while still being easy to transport and store. The ladder should also have a safety mechanism to prevent accidental folding while in use, as safety is a top priority for me. Additionally, I want to know about various height options available and any customization options you may offer, such as color or branding. Please provide information on your minimum order quantities, pricing, lead times, and shipping options. If you have any catalogs or product specifications, I'd appreciate it if you could send those along too. I look forward to your prompt response.