Barb, I agree the weight is probably the biggest concern. Common size canner (23 quarts) would weight around 55#, heavy for a glass top. A larger canner (double stack) could easily cause a break.
Zana and GrowingCoastal, thanks. The big box fully loaded weighs around 40#, fairly maneuverable to me -not to petite DW. Smaller/pint-sized box much easier. Most often they sit on a shelf and get emptied one jar at a time -then when box is empty on to the box below.
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