Nice idea for using the Jam Handles on your Ram Box! You should work with
@Waterfowler41 and the Jam Handle inventor and design a handle for the Ram Boxes, maybe using a hinge so the Jam Handle folds down for easier gripping??? Smaller market, BUT cool if done.
I honestly works quite well grip wise, however for jam handles to allow an easy, safe, fluid, 1-step closing movement they need to be as close to edge as possible, with as little "lip" as possible on what you're closing, and a good amount of hinge degree movement giving you time to get fingers out of way. More hinge movement can make up for the other two, hence why doors are so perfect for them. Door weight also helps.
The rambox surface I used was as close as I could get, but the rambox lip is kind of long compared to doors and the hinge movement is minimal so not much time to gets fingers out. Lids are also kind of light requiring more force to close, and given the other rambox+jam handle characteristics I don't even feel comfortable attempting it in one motion.
I'll do some thinking on a better handle for ramboxes, something that would be a single fluid motion without having to grip painted surface or reaching over to plastic. As it is though the jam handles made 2-step closing better for me so I'm happy.