I would think a reg old 48" liner would stretch to 54" in the middle if it is a saucer shape. You could get some more sand in there to shape it if you want to replace the liner inexpensively. When I had my 24' above ground installed 10 yrs ago, the installers said they could "saucer" the bottom up to 12", and the liner would stretch without a problem, although I only chose 6".
I dont have a doughboy so cant comment on its quality, but I bought a "middle of the road" pool 10 yrs ago and it is still in great shape.
If you definately want to move it, go new.
Bookmarks