Yes the Ridgeline might be too light-duty , once you load up the truck with all your stuff then add the trailer. Load the truck and take it to a scale, then decide what you can tow.
Don't let some salesman talk you into doing something without YOU weighing it first. A 3000# dry wt. trailer will roll down the road at 4500#. Watch your tongue weight and tire rating.
In order to find what you want.
I think you have go longer than 16 ft without going to a slide model which will add hundreds of pounds ?
http://gulfstreamrvtrailers.com/amerilite/floorplans.php#198BHyou could find a floorplan like this and, if it doesn't already have one, fabricate a flip-down bunk over the queen bed. They fold up during non use times. Anyone with basic construction skills can make one.
http://www.redmanstrailers.com/2016-starcraft-17rd-ar-one-travel-trailer/People have done this by fabricating a platform onto the trailer bed which accepts the camper and offers storage. Trailer brakes can be added . This trailer link is just for an idea, other more heavy duty trailers are avl.
How about this combination ? this lightweight Liberty camper has a flip down bunk bed over the dinette and mom and dad get a full 60x80 queen..not to mention a small kitchen and bath...its all self contained and the camper overhead, can hang over the trucks bed offering you a short rig, easy to back into tight spots.
http://sleequipment.com/utility-trailer-5-x10.html?gclid=Cj0KEQiArou2BRDcoN_c6NDI3oMBEiQANeix5tfhNT1WYsLrMLSIoiQ-PcAqvUeWlHh6xRG7A95nxzoaAlh68P8HAQ#product_tabs_additional_tabbedhttp://www.northstarcampers.com/online-catalog.php?view=item&parentId=15&catId=16&numId=54