It was Aviation Week September 17, 2007 page 32, an article by Frank Morring, Jr. called 'Gimme Shelter'

He mentions Geoffrey Yoder as being the lead and the CGI image is of a 12 wheeled inclosed lunar-rover concept with two suits attached at the back. I haven't found it on the web and haven;t time to scan it to Flickr or some place to make it viewable here.

To answer Mr. Fibuli lawn chairs open rover objections. The inclosed pressurized rover allows radiation shielding to be place on top of the vehicle and the whole exploration and research strategy is different for the two very different types of rovers. I don't think an open rover is in fact a "most efficient" design over an inclosed rover with suits attached. You can travel long distances in a the inclosed rover and avoid dust contamination and protect against radiation exposer. But, then you have to rely on the suits not spring leaks or have some other suits as spares and an airlock.