Lightest would probably be one of the early 1970s Bolers. I know that's not what you asked.
Trillium Outback:
Tire: 13"
Height: 7' 10"
Frame: 14' 2"
Body: 10' 1"
Weight: 1395 lbs.
Interior Width: 6'2"
Interior Height: 6'2"
Rear Bed: 6'2" long by 47" wide
Front Lower Bunk: '2" long by 26" wide
Front Top Bunk: 6'2" long by 24" wide
Scamp 13'
Overall length: 13' 0"
Overall height: 7' 6"
Overall width: 6' 8"
Interior length: 10' 0"
Interior height: 6' 3"
Interior width: 6' 6"
Approx.
weight: 1200 lbs.
2200 Lb. axel
Hitch
weight: 100 lbs. approx
Hitch height: approx. 18"
Castia 13'
Overall length: 13' 0"
Overall height: 7' 8"
Overall width: 6' 8"
Interior length: 10' 0"
Interior height: 5' 10"
Approx. weight: 1465 lbs.
2200 Lb. axel
These are from the manufacturers websites.