At least one owner has purchased wheel spacers for a BX24 from Bro-Tek, widening the rear wheelbase by 4 1/2 inches. This will increase stability, but there are some issues to watch out for"
If you use a 54" mower, the wider wheel spacing will interfere with the rear guide wheels of the deck. In short it seems that you can't have both the spacers and mower installed at the same time.
There is a question as to whether the spacers will increase the stress on the axle. (The BX24 manual warns against increasing the distance between the wheels but does not give a reason.
Reverse Pedal Position
Some BX models have the forward and reverse pedals widely spaced. If you find this inconvenient, you can try lifting the forward pedal instead of depressing the reverse pedal.
Sudden Stop in Reverse
(Applies to BX24 and others.) When in reverse, the tractor stops with a sudden jolt when you lift your foot off the pedal. This is normal, though undesirable. Various owners have complained about it on the TBN forums. Currently there is no cure offered by Kubota.
One suggested improvement (BX2350 and maybe others) is to locate the large spring under the right-hand side of the tractor, with an adjustment on it. If you back off on the adjustment, it should put less pressure on the linkage to return to neutral.