( Quoted from Auto123 )
" Five years later, in 2009, we know the Ridgeline uses a revolutionary idea in construction. Ridgeline is the first vehicle to combine a boxed frame and unibody construction. You have to think of it as a full frame, complete with cross members that has the gaps filled in with sheet metal (Honda has gone on to use this type of construction in other vehicles). The biggest advantages to this method of construction are chassis rigidity and light weight compared to a regular truck frame. "
For more information, visit http://www.auto123.com/en/honda/ridgeline/2009/review?carid=1092301401&artid=109312 .