Well, I tried the HEST camping mattress today in store at REI Flagship in Denver and I was hugely impressed. It's extremely comfortable! I pulled out my ursa minor foam cushions at home and went back to REI with an empty bed area in my Ursa Minor. I tried the Dually Long (I had to purchase it to take it out to the parking lot) and then I spent about an hour trying it out. In the back of the Ursa Minor/vehicle the width was fine, but I hadn't realized that the interior tapers a little as you get to the foot area in the front. As a result, I had to squish the mattress to get it in there. First I tried closing the top with the mattress pushed all the way to the rear of the vehicle. I really think that my hinge tamers helped the foam not push the fabric into the hinges. With this configuration the top didn't want to lock in the back. Next I tried pushing the mattress all the way forward and it closed and locked just fine. Next I tried it with my sleeping bags up there. It closed and locked fine. Finally, I tried it with sleeping bags and pillows up above. Since the mattress is shorter than the Ursa Minor, with this solution there is 7 inches of space behind the mattress at the back. I use two of the large Klimit camping pillows currently and I was able to squeeze them in to that 7" gap. The ursa minor closed up pretty nicely. Next, I returned the Duelly to REI and exchanged it for a HEST Foamy one person mattress (they only had one). The dimensions are the same as 1/2 of the Duelly, but I think that there might be some advantage to having two separate mattresses up in case I need to use the hatch in a hurry. The Foamy also has a more robust, perhaps waterproof fabric on the bottom, making it superior to the Duelly. I've ordered a second Foamy and will try them out together this weekend after it arrives. My thoughts so far is that this solution could really work. I'm not sure if I'll have to trim down the foam width a little towards the feet area. It's very close to perfect. I know that this is pushing the limit of what John recommends for mattress height in a Gen 2 JK Ursa Minor, (he recommended a maximum of 3.5" but so far it seems to fit with 3.9". One of the things I really like about HEST is that they are in the business of making awesome camping mattresses - they also have sheets and pillows and comforters and I've already ordered the sheets. I'm going to try it out for a while. My next trip isn't coming up until the end of March so I may need to nap up there to really give it a try. The main downside is the price. About $600 for the two mattresses and $100 more for two fitted sheets. Still, if it improves my sleep in the Ursa Minor it will be well worth it to me.