Just an App, no hardware
I use the "Remote Level" app on my phone from the driver seat, and a second phone on the counter in the trailer. No hardware to by if you have 2 Android phones. No sim card needed, just preload the app and it uses Bluetooth between phones.
That being said, I had a bubble level on the front of my Escape 5.0, but it was too small to easily see. Using that (or a bigger one) with an Anderson Jack was the easiest way to level the trailer side-to-side; then front to back with the trailer jack(s).
One day I'll spend the money on a large level, but the phones I have, and the app was free.
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