Maureen,
I didn't mean to be critical of another Baystater's idea. I like it.
You got me thinking, and I will probably use a piece of 4x4 under the coupler
like your pipe to take the weight off the front wheel for my 1st winter of storage.
Avoids localized aging/flat-spot like the jack stands lifting the tires.
I will leave the jack down and a bit off the floor "in case".