I too have trellissed squash many times, the smaller squash like Delicata etc will hang on there , if you are concerned about the weight make a pantyhose sling to support the weight.
The stems seem to grow stronger when grown vertically.
I have not grown many in pots but have trelliesed plants grown in the ground and put up a frame for years , but I see no reason whatsoever for them not to grow in containers if the soil is enough and they are well fed and watered.
I have grown some prettyy big ones trellised with the aid of slings. As long as the sling is fastened to a secure trellis and not the plany itself.
Go for it, it is very doable.
XX Jeannine
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