Agree, the modular tray needs to be flat and accessible without sliding out. I will put my own gear on the tray or in a bin that goes on the tray. My modular tray system is more like a drawer.That would stick out quite far. Impractical for use in any parking lot, street parking, or garage. Doesn't mean they couldn't do it... but it should be a relatively flat tray with no/short sides so you can still access everything in situations where they can't be puled out.