Niko, I'm using one end of the styrofoam support that it came packed in which is put at the secondary mirror end and packs between the front of the trailer and that end - in case of crash stop! The person who had the scope had made up some semi-circular supports - styrofoam wrapped with duct tape they seem to be. I don't know where they came from - I suspect they were not original packing. One of those supports the rear - between the trunions and the mirrror cell. It all sits on a carpet in the trailer. The trailer bounces along. As long as I have tightened all potential loose screws - screw on finder dovetail bracker, the two screws on the focusser, the "collimation lock" screws tight on the primary mirror cell, the three tilt adjustment screws on the secondary - it travels well. Holds collimation well. The secondary mirror hasn't shifted (rotated) on me, either.
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