Thanks everyone for the info. I am sure I have enough to go on. Yes, it's a truck camper- very nice for a 2004 and we went on a trip with it for the first time last week. It was great having ice cream while camping! 2013 Silverado 8' bed, stock, hauls it just fine but we are looking for a lighter one for a trip to Alaska next year where we used to live. I see some that come in at about 1100 lbs with the pop top. so I am in the market to buy/trade. That collar looks like a frisbee with a hole in the center for the pipe- a very common plumbing item but as soon as camping world had NO IDEA what I was talking about, I began to wonder about it. Thanks......Jeff