This would be my response as well.

You can load your quilt any way you wish if your pattern allows!

Each quilt is different....as are some pantos. If there is a pieced back, I will prefer if the seam runs horizontal, but that too depends on panto being used. But, it seems most panto designs can be running vert.or hor. on a quilt.

This is the way I do it also, on my short-arm....I have enough rolls as it is! I don't do any pantos at all, because my short-arm machine opening isn't large enough for many pantos to be done before I have to roll the quilt.:(

I have quilted both the length and width on a pano on my own quilts. I have had customers asked if I could quilt on the length instead of the width of the quilt for them. They wanted the design to run that way..

I am with all the other quilters. Sometimes the panto and the quilt both want to be loaded widthwise. Sometimes it just doesn't matter and I choose to load lengthwise so I don't have to roll as much. It all boils down to personal choice, as does so much of our quilting hobby.