14" wheels &
tires won't fit unless you raise the trailer high enough to move the axles farther apart.
13" wheels and
tires j-u-s-t fit; an owner in Oregon switched to them years ago... but that brings the
tires within 1-1/2 inches of each other at their center-line... leaving no room for any commercially made chocking system that goes between the tires, and brings the tire very close to the edge of the wheel well.