KKELLER14K, I too like gizmos and my level mate pro is the best thing ever. That said, I don't go out and buy a gizmo just for the idea of buying something.
We have wonderful trailers these days. Indoor bathrooms and showers. Hot water heat, stoves and refrigerators that can run when you are out in the woods. I particularly like the automatic switch over feature on the double propane tanks. This little "gizmo" comes with the trailer! Open both valves and then pay attention. After you have camped for awhile, you will know about how long a tank will last. Check the indicator and when it turns red, it is time to fill the empty tank. I do not switch the valve until I remove the tank to get it filled. You will be drawing propane from the full tank and the indicator will still show red. The red reminds me to fill it up soon.
Some say it is no problem to get out of bed during the cold dark night to go out and open the valve. Well, I would consider it a huge issue. Of course, if you never pay attention to things, this would make sense.