Update for the LevelMatePro:
I can appreciate nightcrawlers desire to build one from scratch as I contemplated it myself. Time being a constraint to build one myself, I decided to find one already built.
Anyway, as I backed in and was about to do my final level for this trip, I opened my Level Mate Pro app and it would not connect to the Level Mate Pro device. After going through all the obvious things (bluetooth, wifi, other like apps running, etc.), I wound up leveling with the level app on my phone. I forgot to bring the level from home. Luckily the pad was already level side to side and the front to back is a snap anyway. After everything was all setup, I decided to check the Level Mate pro unit mounted in the trailer. I removed the battery, replaced the battery, tried to connect and still same thing..... no connection. Even reset my phone and tried again to no avail, it was not going to connect. This was just purchased this in July 2016 so the battery should have lasted longer, or so I thought. I had the DW pick up a fresh pack of those lithium 2032 button cell batteries while she was out. I popped one one of those fresh batteries in and viola.... the app detected it and all my previous data was there. All in all, I still have yet to use it to level the trailer.
I did contact the manufacturer of the product to make record of the issue and the service response was lightning fast. I didn't want a replacement until I was satisfied nothing would get this device to work which they offered. I'm glad it was only the battery, however, my thinking is; "what caused the battery to drain?, was the battery sitting on a shelf for too long?", hopefully the latter, we will see in a few weeks when we go out again. I will keep you all updated as to how this all works out.
I will offer one piece of advice to anyone who purchases this device, replace the battery with a fresh one from a top brand like energizer with a long expiration date immediately. These batteries are cheap for a 5 pack and are found in a variety of devices such as watches, key-less entry remotes, lighting remotes, and the list goes on.. so a 5 pack is not all unrealistic or unnecessary. I really hope by sharing my experience, someone can avoid some of these minor inconveniences.
Happy Camping Everyone!
2015 JayFlight SLX 264BHW
2005 Toyota Sequoia SR5 4.7 V8 trans cooler, elect fans, auto rear leveling system (bags) towing package. Rated to pull (according to dealer) 6700lbs.