If you have a Coleman popup with the channels already on top installed by the factory forget drilling holes in the roof of your trailer Get 8 round top stainless steel bolts nuts and lock washers and grind two sides so that the bolt head slides snugly down the channels. Drill the holes out in the four mounting brackets to fit so the new screws will go through. Assemble the cross bar and bracket, cinch down the 8 nuts and you are done. Solid as a rock, looks sanitary, You will have a great installation with zero drilling of holes in your popup trailers roof. As Coleman accessories are almost impossible to find and costing a kings ransom if you do this is a great installation. I have had many Coleman popup owners checking this out. Next, install a bike carrier next to my Thule Accent 1600.
We purchased 2 twins for camping in Colorado and LOVED them! At first we bought a king, but found any little movement by one person resulted in a "bounce" to the other person. So we returned it for 2 twins and we slept like babies! Yes, the mattress may not have been as full in the morning as it was in the evening, but we didn't bottom out. They are great!
We had friends visiting from out of town with 2 kids so this mattress works great for an extra bed. Her 5 year old boy couldn't wait to sleep on it which has plenty of room (enough for 3 little kids). So he was proud of it and felt like a 'king'. I would recommend this if you need an extra bed. Work for a 'dog house' too instead of a couch. ;)
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