I assume you're going to be putting tripods on these pads?
You could go much smaller and just have the legs on small pads (so 3 little ones per setup). You can then set them up to be closely polar aligned too.
These pads can then be cheap "garden pot" concrete bases (maybe 30cm across or less?). Easy to carry and put in place.
I did this for a while until I got my obs setup.
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