Well, shoot, no, I did not consider how accurate those bubbles were. I'll do some checking to see.
I actually leave the mount on the tripod and carry the lot back and forth. Good weight bearing exercise.
Currently I do setup on the sorry excuse called grass in our backyard. While the ground is fairly firm, I've been mulling over the idea of putting in "stepping stones" or pavers to more permanently mark the position.
In other news: APT and the 6D are not happy with each other - APT sees the 6D, but that's about it - no liveview, no status info, etc. I'm trying to contact the author about it. Got myself a rego key for BackyardEOS to try in the mean time.