I should clarify something about those supply carts - they actually aren't a movable stealth mechanic (this is a common misconception because earlier games had similar features). What you'll want to focus on instead is mastering the shadow system, which gives you much more flexible stealth options. The darkness becomes your best friend because enemies can't spot you at night, and you can actually create your own shadows by taking out light sources with your shuriken (this creates perfect hiding spots on demand).

Something really interesting about the stealth system is how it connects with the eagle vision mode - you can spot patrol patterns and figure out where supplies are being kept, which makes planning your approach much smoother. When you're doing those supply-stealing contracts, focus on using the environment smartly - rooftops, vegetation, and those handy smoke bombs will get you much further than trying to move things around.

Here's a useful tip - if you're struggling with stealth, try tagging resources with scouts first, since they'll handle the transport automatically while you focus on staying hidden