Answer: I don't think the vines really care one way or another. The problem is in supporting the weight of the vines combined with the weight of the pumpkins. Small pumpkins can be held in slings attached to the trellis (old pantyhose works well for this) but the overall weight can be considerable for a trellis structure (especially in windy conditions) so make sure it is a strong one if that's what you decide to try. Depending on the dimensions of the materials you use the specific height is not all that important; be sure however that you allow ample square footage for them to spread along your combined height and width or run.
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