the iKamper is definitely not was I would call a "lightweight". I was able to see the prototype first hand during the Outdoor Retailer show. Some interesting ideas and I will give them credit for exploring unique design rather than just playing copycat like so many other brand tents. There were still some quirky issues that were in the model I saw. I haven't seen the final production version in person yet to know if they've addressed any of those issues or not.
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As was mentioned, sleeping comfort is very subjective and different for everyone. I've never really had a complaint about the foam mattress in my Tepui tents and I've always been quite comfortable. But.....I did just receive my new Tepui Luxury Mattress last night! Very excited to try it out. It's clearly better than the standard mattress.
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The issue with any air mattress is failure and leaks. It's always a risk regardless of the quality. Personally, I'm in favor of a quality foam mattress in a RTT over an air mattress for that reason. There is nothing about a foam mattress that can fail when you're out in the middle of nowhere for several days.
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As for low profile, the upcoming Tepui White Lightning, hardshell is only 8" thick! That is by far, the lowest profile roof tent on the market. Plus the integrated roof bars make it rack ready so that bikes, kayaks, boards or whatever you want can be carried on top of it. I was able to see the first one off the production line last week while I was at Tepui HQ and it's an exciting tent for anyone looking at hardshells.
almost jumped on that kickstarter but was really looking to add a RTT to my vehicle for the fall. It looks amazing and I can't wait to see some reviews/the final product.