I don't have any experience with a Ridgeline but my understanding is that it's a unibody and front wheel/all wheel drive? Like others have said on here, it's not necessarily the weight of a travel trailer that will get you its the aero. For me personally, if I had to tow with a Ridgeline or equivalent I would be looking at a hard sided pop-up. Here is one guys experience. Keep in mind this is a "dry" truck and trailer:
http://www.ridgelineownersclub.com/forums/33-racks-hitches-towing/43685-my-trailer-towing-experience-including-wdh-transmission-mpg-content.html#/forumsite/20673/topics/43685?page=1