Rather than carry chain on my 21 footer, I used to carry a small
mushroom anchor with 10 ft. of 1/2 in. line wrapped around it. If I
thought I was going to need extra line on the anchor rode, I would hook
up the anchor to the end of the 10 ft. line and then attach the anchor
line to the small mushroom anchor (10 lt) That would keep the anchor
rode lying flat and was very easy to store. Didn't use it very often,
Lake St. Clair is not very deep.

Happy boating, Norm