The small box mounts on any near vertical wall that faces forward, back or towards either side. No need for the device to be perfectly level only close. Mine is on the inside of the driver's side wall at the front of the TT. During set up, the device is calibrated and the orientation defined. The website has the instructions and videos for both the set up and install.
The Wireless RV LEVEL is also on Amazon. Another bluetooth remote leveler. Based on the LevelMatePro reviews I have seen and heard, the RV LEVEL has many more features and more accurate and precise measurements. I use the RV LEVEL but have not personally tried the LevelMatePro. Only down side of the RV LEVEL is it does not work with iPhone, but I keep a $20 android phone handy to use as a dedicated remote.
Seems like a smart addition, just insert 2 year watch battery, pair to your phone or tablet, screw it to any wall, zero it out when level and it will show you exactly how low each wheel is. The video shows them driving around the lot looking for level w/o using jacks.
It also goes from RV to RV too, and I have two, so I only buy once, unlike the Mobile Eye that I am also interested in.
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