I've got a 2016 Seismic Wave 310W and have used it once, and ran into this issue. Now the lot I was on was not even remotely close to flat but I was thinking the Out of Stroke had to do with it running out of length to extend, so this thread has helped a ton. I eventually got it to level, after like the 10th try.
Now tonight in my driveway I was trying to autolevel the trailer and ran into this Out of Stroke error. My driveway isn't that unlevel so this was extremely annoying.
I started out leveling it off of the 1 battery that came with the trailer, while it was leveling I plugged the unit into a regular outlet (I'm using 2 dog bones stepping down from 50amp to 30amp to a regular plug) and boy did that speed up the motors. Anyways, it eventually errored out.
With all that said, if I stepped up to 2 or more batteries, would that help this? I've got room to go up to 6 batteries but would rather stay at 2 or 3 (I only have 1 now - interstate marine rv battery srm-27 deep cycle 12v)
You can see how much of a pitch this lot was on, I guess it's the left to right angle that makes a bigger issue?