I've written about my BOB trailer in other discussions. I use a Rubbermaid bin for groceries, and just put the frozen stuff in with everything else. No problem. Now, about your trailer: For 40 bucks it's a great deal! I'm not sure that, personally, I'd do much of anything to modify it. If you really want a cargo trailer, maybe you can sell the current Bell trailer and get a 'real' cargo trailer. OTOH, the Bell looks like it'll haul groceries just fine 'as is'. Perhaps cloth grocery bags?