Yeah when the OP said "Light Duty" he must have meant Tacoma. Those plastic cleats can't hold groceries bags in place. I once saw a guy with a brand new Tacoma and his brand new quad sitting upside down in the middle of the road. I even drove up in my Frontier and offered to help, he told me he had it under control and a tow truck coming.
Anyway to the OP, the tie down system in the Frontier is capable of holding Hover Dam in place. Put whatever you want back there, tie it down, move it and be done with it.