Don't try cooking while rolling down the road? Open the glass cover before cooking? There is not quite enough information to know what you mean. I have not had pots or pans slide off.

Are you trying to use it while the R-Pod is not leveled? Do you have the two tabs locked in to the holes in the cooktop for the pan support grates? Do you have the cooktop screwed down to the stove with the two screws? Do you have the stove body screwed to the countertop (take the stove top off and look for this one. Mine wasn't until I did so).

Once you use the stove for a bit, the burner grates will get a little rough which should provide enough friction to resist the movement of the pots.  Run the flame on them without a pot and get them really hot and it will roughen them up a little faster.  Just don't let them get so hot the enamel starts to burn up or melt off them.  

Of course, if you really wanted to be creative, you could get a gimbaled marine stove.  They come with little pot holding arms that attach to the stove.  That's how I cooked while at sea and unless it was really nasty, the pots stayed on just fine.