Thanks for the great replies. I drive a 2006 Dodge Ram 2500 long bed extended cab with Ride-Right Air Springs, so size and weight in the class of camper I'm looking at are not too big an issue. The biggest reason I want to keep the camper lighter and smaller are for ease of highway travel (tractor-trailer cross wind, etc.) and off road maneuverability (within reason). We tow about 5000 lbs of boat, motor and trailer and about the same of Jeep and trailer. Also when launching a boat I want a small enough camper that onlookers don't see me and say something like, "Hey Margie! You gotta come watch this with me!"
Also, it's just the two of us, with an increasing occasional grand child or two tagging along.