Hi Auntie M,
Not sure of the exact model you are looking at. In our sales brochure section they list a lot of good specs on the campers.
If you know the year and ideally the model number, you can look up the camper specs from our Sunline brochures in the FILES section. If you do not know the model, then look at the year and match up the floor plan and length spec to find the model.
To get to the files section, you need to be logged into the forum.
At the top of the forum are tabs, look for the word "FILES" click it.
Once into the files section, scroll down to the "Sunline Brochures" section. Go in there and find a sale brochure for the camper you are looking at and down load a copy. They also list empty camper tongue weights on most models. But remember, the tongue weight goes up from the brochure dry weight when you load the camper. The loaded tongue weight is needed as your tow vehicle has to be able to hold it up or you use a special WD hitch.
On the value, with Covid going on, campers of all kinds are selling like crazy. Some are good, some are not and the prices are all over the map. The price all depends on what the prior owner did to it, good or bad and what shape it is in.
This NADA RV site shows what a functioning camper can be valued at. I linked a 15.5 ft Sunline, but the length makes little difference for a foot +/- on a camper that old. https://www.nadaguides.com/RVs/1981/...4062840/Values
Also scroll to the bottom of that page and read the detail on how that Average retail value is made up from.
One of the biggest issues with any brand of used camper can be water hidden water damage. The Sunlines are all repairable if you have basic wood working tools, skills, time and the will to want to do the repair. Hiring out water damage repairs takes lot of hours and the cost can add up very high. If you really want to know if the camper has water damage, see this post on a moisture meter. Water damage in a camper most times is not seen inside the living space until many years after the leak started. Campers do not leak like a house where you can see the leak quickly. So not seeing any signs of water damage inside the camper does not tell you if it is not trapped in the walls or ceiling. The meter will scan the inside walls etc. and tell you if it is dry or wet behind the wall board. Finding water damage does not mean, not to buy it, it means you know going in, this will need some work and you may be able to lower the price if the seller will believe you. I suggest anyone owning a camper or looking to buy one, get one of these meters. Sooner or later you will need to use it.
Tires age, battery life, an awning condition if it has one, trailer brakes if they work or not on the old campers, all factor into the price.
Finding an old camper in decent shape, and realizing it may need work to get it going, can be a real good find. The price is an issue as to what you may need to put into it to have it last and suit your needs.
Hope this helps and good luck finding your Sunny!
PS. if you want us to look at it, posting pics helps and we can see what it looks like to give a better help. Pics inside and out help greatly. You may find a real gem stored inside or one that was outside for the last 40 years.