Dave,
I used two of the nylon and rubber draw latches. These are easy to open and close. I did mount them so that the latch part is on the teardrop and the bracket is on the hatch. That way I don't have the latch hanging down when the hatch is opened.
I had purchased two different types of metal draw latches. For one, I didn't use it because I didn't care for the galvanized steel finish on one. For the other, I just didn't like the aesthetics of the design.
My plan was to install a stainless steel hasp too, so I can lock the hatch, but haven't found the need to. Our teardrop is stored in the garage at home, and where we camp I'm not too worried about security. We're of the mindset that we'd rather any potential thief get what they are going to take and not destroy our teardrop in the process.
Take care,
Tom