These particular parts are likely interchangeable. However, it's a common misconception that all the tents coming from China are made in the same factory with different logos slapped on them. There are literally dozens of factories in China that are now manufacturing tents, many of which use the same basic designs. But it's important to note that there is a very wide range of materials used as well as quality. And that can also be the case for a factory that is producing tents for two different companies in the same facility. Bottom line is all RTT's are not created equal. There have even been cases of material grade/weight not being what is advertised. There are still a lot of great tent options out there, just do your homework and pick the one best suited for your needs that will give you quality and durability.
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If you've followed Tepui for any amount of time you'll know that they are consistently the first to innovate and bring new ideas and designs etc to market. The Ruggedized models are one example, and there are other companies now doing their own versions. The weather hoods are another example. There are some new exciting things currently in the works at Tepui that will once again bring innovation and top quality to the market soon.